Additional file 1.
Appendix. List of analyzed literature with reference, level of evidence and discussed hypothesis (1: author supporting or acknowledging the discussed hypotheses, 2: author refuting the presented hypothesis). The numbers at the bottom represent the sum of articles supporting or acknowledging the discussed hypotheses.
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Stahl et al. BMC Musculoskeletal Disorders 2012 13:225 doi:10.1186/1471-2474-13-225