Additional file 1:

Table S2. Schematic assessment of the methodological quality of the included studies. The Table gives the items of the quality assessment list and the scoring of the individual studies included in the review.

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Additional file 2:

Table S3. Summary of case definition criteria in the included epidemiological studies. Table gives the criteria for classification of musculoskeletal disorders used in the individual studies. The descriptions of these criteria make reference to six papers [91-96] not cited elsewhere in this review.

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Additional file 3:

Table S4. Summary of included epidemiological studies. The Table provides information on study design, population, response rate, physical examination, exposure measures, confounder control, and results relevant for this review presented in the individual studies.

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