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.

Format: XLS Size: 25KB Download file

This file can be viewed with: Microsoft Excel Viewer

Stahl et al. BMC Musculoskeletal Disorders 2012 13:225   doi:10.1186/1471-2474-13-225