​cebm ​net/​?​o=​1116) Level Therapy/Prevention, Aetiology/Harm P

​cebm.​net/​?​o=​1116) Level Therapy/Prevention, Aetiology/Harm Prognosis Diagnosis Differential diagnosis/symptom prevalence study Economic and decision analyses 1a SR (with homogeneity*) of RCTs SR (with homogeneity*) of inception cohort studies; CDR† validated in different populations SR (with homogeneity*) of Level 1 diagnostic studies; CDR† with 1b studies from different check details clinical centres

SR (with homogeneity*) of prospective cohort studies SR (with homogeneity*) of Level 1 economic studies 1b Individual RCT (with narrow Confidence see more Interval‡) Individual inception cohort study with > 80% follow-up; CDR† validated in a single population Validating** cohort study with good††† reference standards; or CDR† tested within one clinical centre Prospective cohort study with good follow-up**** Analysis based on clinically sensible costs or alternatives; systematic review(s) of the evidence; and including multi-way sensitivity analyses 1c All or none§ All or none case-series Absolute SpPins and SnNouts†† All or none case-series Absolute better-value or worse-value analyses †††† 2a SR (with homogeneity*) of cohort studies SR (with homogeneity*) of either retrospective cohort studies or untreated control groups in RCTs SR (with homogeneity*)

click here of Level >2 diagnostic studies SR (with homogeneity*) of 2b and better studies SR (with homogeneity*) of Level >2 economic studies 2b Individual cohort study (including low mafosfamide quality RCT; e.g., <80% follow-up) Retrospective cohort study or follow-up of untreated control patients in an RCT; Derivation of CDR† or validated on split-sample§§§ only Exploratory** cohort study with good††† reference standards; CDR† after derivation, or validated

only on split-sample§§§ or databases Retrospective cohort study, or poor follow-up Analysis based on clinically sensible costs or alternatives; limited review(s) of the evidence, or single studies; and including multi-way sensitivity analyses 2c “”Outcomes”" Research; Ecological studies “”Outcomes”" Research   Ecological studies Audit or outcomes research 3a SR (with homogeneity*) of case-control studies   SR (with homogeneity*) of 3b and better studies SR (with homogeneity*) of 3b and better studies SR (with homogeneity*) of 3b and better studies 3b Individual Case-Control Study   Non-consecutive study; or without consistently applied reference standards Non-consecutive cohort study, or very limited population Analysis based on limited alternatives or costs, poor quality estimates of data, but including sensitivity analyses incorporating clinically sensible variations.

Besides, van Abbema et al (2011) showed that a “low lifting test

Besides, van Abbema et al. (2011) showed that a “low lifting test” was not related to pain duration VX 770 and showed conflicting evidence for associations with pain intensity, fear of movement/(re)injury, depression, gender, and age. Thereby, these lifting tests assess more than “just” physical components. Moreover, lifting is an important predictor of work ability in patients with MSDs (Martimo et al. 2007; Van Abbema et al. 2011). Additionally, it is plausible that “shared behaviors” occur Eltanexor between the tests, in which case the added value of extra tests decreases.

The selection of the lifting tests appears in line with the three-step model as suggested by Gouttebarge et al. (2010) to assess physical work ability in workers with MSDs more efficiently using a limited number of tests. Regarding its predictive value, this study showed that strong evidence exists that a number of performance-based measures are predictive of work participation for patients with chronic MSDs, irrespective whether it concerns complaints of the upper extremity, lower extremity, or low back. All patients in the included studies were considered able to perform these reliable tests, and no comments were made that Fedratinib solubility dmso patients were unwilling to perform these tests. Of course,

one has to bear in mind that the results of the performance-based measures are often used in clinical decision making regarding work participation. Moreover, patients are often not blinded to the outcome of the test itself (Reneman and Soer 2010). Gross and Battié (2004, 2006) and Gross et al. (2004) adjusted their outcome for the recommendation of the physician and Streibelt et al. (2009) for the expectation of the patient. Nevertheless, they still found that a number of performance-based tests were predictive of work participation. It seems worthwhile to establish how physicians and patients take into account Astemizole the results of the performance-based tests and other instruments in their decision making regarding work participation. Finally,

the studies in this review used outcome measures in terms of future work participation and/or future non-work participation. Although not all studies presented relevant statistics, it seemed that the predictive strength of performance-based measures is higher for non-work participation than for work participation. For instance, for non-work participation, the predictive quality varied between poor (Vowles et al. 2004; Streibelt et al. 2009), moderate (Bachman et al. 2003; Streibelt et al. 2009), and good (Kool et al. 2002). For work participation, the predictive quality was mostly poor (Gross et al. 2004, 2006; Gross and Battié 2006; Gouttebarge et al. 2009a). Future directions A number of performance-based measures are predictive of work participation.

nodHPQ gene products are involved in the sulfation of C-6 of the

nodHPQ gene products are involved in the sulfation of C-6 of the reducing terminus [50, 51] and NodIJ are involved in the export of Nod factors [52, 53]. The R. grahamii pSym also has nodEF-hsnT. NodE and NodF are involved in the synthesis of unsaturated fatty acids [54] and HsnT is an acyltransferase of non specified function. Based on the nod genes found, R. grahamii Nod factor structure was predicted as a chitin backbone of N-acetylglucosamine

residues N-acylated with polyunsaturated fatty acids, N-methylated at the https://www.selleckchem.com/products/sgc-cbp30.html C-2 nonreducing terminal and carbamoylated at C-6 of the same residue. At the reducing end this Nod factor may be substituted at the C-6 position with

sulfate. The symbiotic plasmids most similar to pRgrCCGE502a were those from R. mesoamericanum strains. A comparison of nod genes revealed that R. grahamii CCGE502 and R. mesomericanum STM3625 have almost the same nodulation gene products, ranging from 69% to 99% amino acid similarity (Figure 2). Despite this similarity, some differences were observed in overall pSym gene content as well as in individual nod genes (Figure 1C, Figure 2). R. mesoamericanum STM3625 ON-01910 datasheet lacks nodEF-hsnT but harbors two copies of nodA and three copies of nodD, while R. grahamii only presented one nodA and two nodD gene copies. R. grahamii had two nodO and one nodM gene copies located distant to the sym cluster. They encode a Ca-binding protein that is thought to form cation-specific channels in plant membranes [55] and a glucosamine 6-phosphate synthase, respectively. R. mesoamericanum STM3625 also has two nodO and one nodM gene copies; nodO2 and nodM showed an identical genetic context, while nodO1 is found in a different genetic context. Figure 2 BIIB057 Alignment of symbiotic plasmids of R. grahamii CCGE502 (pRgrCCGE502a) and R. mesoamericanum STM3625 (pRmeSTM3625 2). Numbers indicate Anacetrapib nucleotide positions and arrows the open reading frames in each replicon. Red and yellow

lines indicate conserved regions with the same direction. Yellow lines show conserved symbiosis regions including nif, fix and nod genes. Blue lines indicate inverted conserved regions. In relation to nif/fix genes, a complete set of genes for nitrogen fixation were found in R. grahamii. Some repeated genes, such as nifQ and nifW were also found. nifW had not been found in other Rhizobium species. There were two copies in both R. grahamii and R. mesoamericanum STM3625. Moreover, RGCCGE502_32751 (nifW1) had 92% similarity with BNN_260005 from R. mesoamericanum strain STM3625, and RGCCGE502_33006 (nifW2) had 98% similarity with BNN_270058 from R. mesoamericanum strain STM3625. nifQ was located next to nifW genes in R. grahamii and in R. mesoamericanum STM3625.

As S1 nuclease protection assays were performed using total RNA i

As S1 nuclease protection assays were performed using total RNA isolated from cells submitted to a higher concentration of cadmium (250 μM) than those used in the construction of the stress libraries (50 and 100 μM), we also

performed these assays with RNA isolated from cells submitted to 25, 50 and 100 μM CdCl2 to verify the effect of different cadmium concentrations on hsp70-1 intron splicing. We observed a more pronounced block in the processing of hsp70-1 intron when B. emersonii cells were treated with 100 μM CdCl2 than with 50 μM CdCl2, while with 25 μM CdCl2 no inhibition of Alvocidib purchase splicing was detected (Additional file 3). These results indicate that

inhibition of splicing by cadmium treatment can be dose-dependent, consistent with our observation that a larger number Idasanutlin of iESTs is found in the cDNA library AZD2014 nmr constructed from cells submitted to 100 μM CdCl2 (CDC) than from cells exposed to 50 μM CdCl2 (CDM) (Additional file 1). Induction of thermotolerance by incubation at moderate temperatures restores splicing To test whether a pretreatment at moderate heat shock temperatures could exert some effect on mRNA processing in B. emersonii cells, S1 nuclease protection assays were performed using RNA samples from cells incubated at 38°C for 30 min prior to exposure to extreme heat shock temperature (42°C) or cadmium treatment. In these experiments, it was possible to observe

that splicing inhibition occurring at 42°C could be completely reversed if pre-incubation at 38°C was associated with incubation at 27°C for 30 min after exposure to the extreme heat shock temperature (Figure 4A), which could be considered a recovery period. Furthermore, protein fantofarone synthesis was necessary during the entire experiment, as addition of cycloheximide (10 μg/ml) at any time during cell incubation at the various temperatures prevented complete recovery of the cells’ capacity to carry out splicing of hsp70-1 intron (not shown). In particular, addition of cycloheximide before the pre-incubation step at 38°C, revealed that this treatment is essential for reversing splicing inhibition, as no spliced mRNA is detected under this condition (not shown). In the case of splicing inhibition due to exposure to cadmium, pre-incubation at 38°C prior to heavy metal treatment was also capable of reversing inhibition (Figure 4B), but complete recovery of the splicing capacity was observed only if exposure to cadmium was followed by incubation at 27°C in the absence of the metal (Figure 4B).

However, the mineral samples available for laboratory experiments

However, the mineral samples available for laboratory experiments usually display very large dimensions, which preclude any potential applications. Green rusts (GR) are layered FeII-FeIII hydroxisalts composed of positively charged Fe(OH)6 octahedra sheets alternating

with interlayers filled with charge-compensating Salubrinal Microtubule Associated inhibitor anions and water molecules [13]. Early studies on the reduction of AgI or AuIII by green rusts were reported in 2003, from Heasmann et al. and O’Loughlin et al. [14, 15]. The presence of Au or Ag metal was evidenced by X-ray absorption spectroscopy and transmission electron microscopy. Later, these green rusts doped with very low metal loads were utilized as reducing compounds for the removal of some chlorinated hydrocarbons [16, 17]. In these studies, the reaction mechanisms between green rust and soluble

metal precursor were not detailed and none of the studies gave an evidence of metallic particles by X-ray diffraction (XRD). The proposed mechanism involves the oxidation of sulfate green rust into magnetite Fe3O4, coupled to the reduction of AuIII or AgI to Au or Ag. The oxidation mechanisms of green rusts have been extensively studied. This reaction can imply transformations via solution, i.e., dissolution, oxidation, and precipitation of the resulting ferric oxy-hydroxides, lepidocrocite, and goethite [18, 19]. Otherwise, a solid-state oxidation SAHA HDAC order of green rusts involving both the conversion of FeII to FeIII inside the crystal lattice and the charge-compensating loss of protons is also possible [19–22]. The latter mechanism especially occurs when high oxidation rate is imposed, for example, by reaction with some soluble oxidizers such as H2O2. The resulting ferric products, named as ‘exGR-Fe(III)’ or as ‘ferric green rust’, keep the same apparent morphology Resminostat as the initial green rusts; only local disorders at nanometric scale are induced, as indicated by the disappearance or the large

decrease of (00l) lines in diffraction patterns [19, 21, 22]. In the present paper, we introduce a new one-pot synthesis of supported noble metal nanoparticles in which the green rust particle is an individual micro-reactor acting as both the reducing agent and the support for the resulting metal nanoparticles. Carbonate (GRc) or sulfate (GRs) green rust suspensions were obtained from the oxidation by air of slightly alkaline solutions containing ferrous species and carbonate or sulfate anions and the reactions with AuIII or AgI were operated shortly after, in the same solution [23]. Our purpose is the production of Au or Ag nanoparticles by this new method and we therefore target high metal loads. This simple synthesis is carried out at near ambient temperature, in aqueous solution, and requires only common salts; it is environment friendly since no organic solvents/additives are used and the filtrates do not represent a problem for recycling.

1g/kg of body weight, with or without a continuous dose of β-ALA

1g/kg of body weight, with or without a continuous dose of β-ALA of 0.1g/kg of body weight. They reported for testing at baseline, day 7 and day 28. Testing sessions consisted of a resting muscle biopsy of the vastus lateralis, body composition measurements (DEXA), a selleck chemical graded exercise test on the cycle ergometer for VO2max and lactate threshold, and multiple Wingate tests for anaerobic exercise performance. Results Results showed all supplementation strategies increasing muscle carnosine levels

over placebo after four weeks, but not between groups. The percent change for each group after four weeks were 35.3±44.8% (p=0.02) Dabrafenib manufacturer for BA, 42.5±99.3% (p=0.01) for BAC, 0.7±27.1% (p=0.04) for CRE versus 13.9±44.0% for PLA. Muscle total creatine showed trends of increasing for all active supplement groups after four weeks, but not between groups. The percent change in muscle creatine after four weeks was 4.6±71.4% for BA, 154.0±375.0% for BAC, 1.7±41.6% for CRE and -4.1±10.9% for PLA

(p=0.72). There were improvements for all groups with percent body fat after four weeks (p=0.01), despite the present study not including a specific training protocol. The delta values were -2.3±2.6% BAC, -1.4±4.5% CRE, 0.2±1.8% BA and -1.3±2.2% PLA. There were no group differences observed for VO2max (p=0.27), peak lactate (p=0.05) lactate threshold (p=0.67), ventilatory threshold (p=0.35), peak power (p=0.42), mean power selleck chemicals (0.28),

total work (p=0.28) or rate of fatigue (0.20). There were some trends for anaerobic exercise indicating groups supplementing with creatine may have greater improvements, however, these findings were not statistically significant. Conclusions The present study failed to show any additive effects of β-ALA and creatine supplementation for body composition, aerobic exercise, lactate threshold or anaerobic exercise measures. This could be due to the small sample size resulting in low power and effect sizes. Previous research ADAMTS5 has demonstrated that four weeks of β-ALA and creatine supplementation was enough time to increase muscle carnosine and phosphagen levels. However, perhaps more time is needed for performance adaptations to occur, especially without the addition of an exercise training component. Acknowledgements Supported by AlzChem Trostberg GmbH.”
“Background Echinacea purpurea, a purple coneflower plant of the compositae family (Asteraceae), is native to North America and commonly used as an herbal supplement to enhance immune function. Echinacea purpurea has been shown to stimulate macrophage activity which is a known stimulator of nitric oxide (NO) production. Echinacea purpurea supplementation (8,000 mg·d-1) in untrained (42.5 ± 1.6 mL·kg-1·min-1) males was shown to elicit a 63% increase (p < 0.05) in serum erythropoietin (EPO) following two weeks of supplementation.

Each phage was tested against each bacterial strain in triplicate

Each phage was tested against each bacterial strain in triplicate in independent experiments. The lysis was categorized as clear (+), turbid (0) and no reaction (-) as described [14]. Phage growth characteristics To determine phage growth characteristics, such as burst size and duration of the infection cycle, single step growth experiments were performed as previously described for phage JG024 [46]. The burst size was determined as: (phage titer at the end of the single step growth curve at

time point 34 min minus phage titer at time point 11 min) divided by phage titer at time point 11 min. The latent phase was estimated at the midpoint of the exponential phase of a one step growth experiment [47, 48]. Sequencing, analysis and Selleck RAD001 annotation of phage genome To isolate phage DNA, phages were propagated in top-agar plates as described above. After growth at 37°C the plates were overlayed with 10 ml SM buffer and incubated with shaking at 4°C GKT137831 for 4 h. The supernatant was filtrated (0.22 μm) and stored at 4°C. Phage DNA was isolated using the Qiagen (Hilden, Germany) Lambda Kit according to manufacturer’s instructions. Ten ml phage lysate with a titer of at least 1010 phages/ml were used to isolate up to 1 μg/ μl pure phage DNA. Digestion with

restriction endonucleases was done following the protocols of the manufacturer. Whole genome see more sequencing of the phage JG024 was done at the McGill University and Génome Québec Innovation Centre (Montréal, QC, Canada) using the Genome Sequencer FLX and 454 Technology. A total of 19294 reads with an average length of 344 bases was assembled to one single contig with a 67-fold coverage. The annotation of the unknown phage genes was done by using the software GeneMark.HMM [26]. The Heuristic approach of GeneMark was used to identify genes in small genomes under 100 kb. The identified genes were compared with the NCBI ORF Finder [49]. Nucleotide sequences were scanned for homologues using the Basic Alignment Search Tool (blastx) [50]. To search for tRNA genes in the phage

genome sequence, the internet tool tRNAscan-SE 1.21 [20] was used. Results were compared with the phage PAK-P1 annotation. Sequence comparison was conducted using ClustalW2 online analysis tool [51]. Investigation of the codon usage was performed using a software tool based Niclosamide on JCat [52]. The genome sequence as well as the annotation is deposited at GenBank (National Center for Biotechnology Information) using the following accession number: GU988610. Verification of genome ends To verify the genome ends, we amplified approximately 1300 bp of the ends of the genome by PCR and sequenced the PCR products using sequencing service of GATC Biotech (Konstanz, Germany). 30 ng genomic DNA of JG004 (see above) were used as a template in a standard PCR using TrueStart Taq polymerase (Fermentas AB, Helsingborg, Sweden) and primers described in Additional file 2, Fig. S4.

No difference was found between the two experimental conditions (

No difference was found between the two experimental conditions (PLA and CAF) for the VL, RF, Torin 1 purchase VM and QF muscles. Thus, no significant group main effect or group by moment interaction was identified (P > 0.05). There was a progressive increase in the RPE during the test in both groups, without any statistically significant differences between them (P > 0.05). Only a significant distance main effect was identified for HR and RPE (P < 0.001). No statistically significant difference (P > 0.05) was detected in the RPE increase rate between groups (PLA = 0.88 points.km−1 vs. CAF = 0.95 points.km−1). Mood changes before and after the 20-km time trials are illustrated

in Figure 3. Figure 2 Pattern of EMG activity of the VL, RF, VM and QF muscles during

the 20-km time-trial test under the conditions CAF (n = 12) and PLA (n = 12). No main effect or group vs. time interaction was identified (P > 0.05). Figure 3 Variation delta of mood (BRUMSpost – BRUMSpre) in their various domains in the 20-km time-trial (n = 13). Discussion The main result obtained in this study was that the oral administration of 6 mg.kg−1 of body mass of CAF 60 min before the effort had no effect on the performance of cyclists in the 20-km time trial. The results also indicated that the use of CAF did not promote any changes CYC202 in pacing strategy during the test or attenuation of RPE. Although our results are interesting, comparisons with previous studies are really very difficult due to differences in the protocols. In a time trial study performed by McNaughton et al. [16], although Paclitaxel the distance was similar to that used here, the authors included some uphill stretches, which made the test harder, naturally forcing their athletes to assume different pacing strategies. Additionally, their subjects ingested CAF in the form of a low-kilojoule flavored drink, and the authors did not mention whether the subjects were able to distinguish between the drink containing CAF or PLA. In another study conducted by Ivy et al. [15], CAF was used in combination with other substances (click here labeled as an “energy drink”) to compete a fixed amount

of work on a cycle ergometer in significantly less time than after consuming a placebo. Thus, the results of these studies cannot be compared with our results. The stimulatory effect of CAF on the central nervous system appears not only to modify the parameters of motivation, but also to attenuate RPE, enabling cyclists to sustain the discomfort caused by exercise. The magnitude of this effect has been reported to be close to 6% during constant load exercise, increasing time to exhaustion [10]. However, this effect was not observed in this study. Our results showed that RPE showed no differences when the two trial conditions were compared. The RPE increase rate verified by the slope on the regression plot for RPE values throughout the test, showed no significant differences between conditions (0.88 points.km−1 vs.

The difference was due to a single point mutation in the capsule

The difference was due to a single point mutation in the capsule gene cpsE. The resulting loss of capsule expression had clear consequences resulting in increased bacterial

growth, adherence to epithelial cells and competence for genetic transformation. We speculate that the mutation occurred in vivo because the isolate contained an approximately 1:1 ratio of the encapsulated and check details nonencapsulated Capmatinib datasheet phenotypes. This is unlikely to have been achieved during the brief single laboratory culture before freezing the sample. We therefore conclude that the original colony derived directly from the patient contained a mixture of the encapsulated and nonencapsulated phenotypes. Mutations in cpsE have been shown previously to lead to loss of capsule expression in clinical isolates. In 2012, Melchiorre et al., reported two pneumococcal isolates from patients with this website bacteraemic pneumonia. These isolates

were nonencapsulated but with capsule operons very similar to those of serotype 7F strains. The isolates had two distinct point mutations in cpsE both resulting in premature termination of transcription, CpsE which was truncated at the C terminus and loss of encapsulation in these two strains [62]. CpsE is the initial glycosyltransferase responsible for the addition of activated glucose-phosphate to the lipid carrier in the bacterial membrane [36-40]. Laboratory-generated cpsE knock-out mutants are also nonencapsulated [12]. Here it appears that an encapsulated and nonencapsulated phenotype can co-exist in the nasopharynx. It is also the first time a naturally-occurring mutation in cpsE leading to loss of capsule expression has been described in a Carnitine palmitoyltransferase II serotype 18C strain. Unlike the SNP described by Melchiorre et al., the SNP described here does not result in a premature stop

codon but rather an amino acid change from arginine to glycine. In addition, the location of the SNP differs from those described previously [34,35,62]. Our data suggest that the amino acid at position 379 in the cytoplasmic C terminal region of CpsE is critical for the function of the protein and therefore polysaccharide capsule production. cpsE is the first serotype specific gene following the conserved genes cpsA to cpsD [14,15]. However, there is high sequence similarity of cpsE gene throughout the serotypes [12,37-41,63,64] which raises the possibility that SNPs in cpsE may be a more general phenomenon to control capsule expression in other serotypes. This mechanism seems to be irreversible in contrast to the previously described mechanism of loss of capsule expression by spontaneous sequence duplication in the capsule operon [29,30].

4 % Table 1 Population attributable fractions [PAF%, 95 % confid

4 %. Table 1 Population attributable fractions [PAF%, 95 % confidence intervals (CI), if available] for occupational stress related to cardiovascular diseases in different countries estimated with different methods   Germany Finlanda Swedenb Francec Europe Job strain   M 16 % F 19 % M 6.7 % F 14.7 % 6.5–25.5 %

3.40 %d (CI 1.5–5.4) Proxy EWCSe CYC202 5.23 % (CI 1.49–8.97) 3.85 % (CI 1.06–6.64) 2.86 % (CI 0.75–4.96) 3.65 % (CI 1.00–6.31) 4.46 % (CI 1.26–7.65) ERI 1.2–25.7 %f         Proxy EWCSe 19.5 % (CI −2.51 to 40.82) 17.16 % (CI −2.71 to 37.03) 16.44 % (CI −2.75–35.64) 18.83 % (CI 2.45–40.19) 18.21 % (CI 2.58–39.01) EWCS European Working Conditions Survey aNurminen and Karjalainen (2001), m males, f females, PAF for shift work,

involving work strain bJärvholm et al. (2013), m males, f females cSultan-Taïeb et al. (2011) dKivimäki et al. (2012) eNiedhammer et al. (2013) fBacké et al. (2013) Apart from the differences in methods to estimate the prevalence of job strain (e.g., complete questionnaire or proxy measures) as well as the selection of studies giving information on risk estimates for the association of CVD and job strain, there is another issue that needs to be addressed. LB-100 order within the Karasek model, Alisertib job strain is defined by the presence of high demand combined with low decision latitude. Median cut points are used to define high demand, low control, and job strain. This is arbitrary. Further cutoffs vary depending on the structure of occupations within the population. If one supposes that levels of demand and control differ between countries (Moncada et al. 2010) and given the lack of a population-independent cutoff for job stress, identical answers to the demand and

control scales may be considered as low stress in one country Selleckchem Cobimetinib and as high stress in another country. This point is also mentioned by Niedhammer et al. as possible limitation of their study. But additionally the question remains whether these frequencies calculated within the Karasek model are comparable to other psychosocial job exposure prevalence rates that can theoretically reach 100 % (e.g., the number of subjects working more than 48 h a week). Job strain by definition is one of four categories in the model, resulting from dichotomization of the demand scale and the control scale that can maximally reach 50 %. Also for the estimation of PAFs for ERI, some methodological problems need to be discussed: the risk estimates used to calculate PAFs are based on studies comparing high effort–reward imbalance (upper tertile or quartile) with the baseline quantile (Kuper et al. 2002; Kivimäki et al. 2002). It is questionable whether risk estimates for upper quantiles can be combined with prevalence estimates for effort–reward imbalance above 1 obtained from surveys.