PubMed, PEDro and CINAHL were searched from inception until October 2014, using medical subject headings (MeSH) and key words including anatomical terms, disorder or syndrome terms, and treatment terms.The full search strategy is presented in Appendix 1 on the eAddenda. There were no language restrictions.The references of the systematic reviews and (quasi-) randomised trials identified by the electronic searches were also scanned for potentially relevant articles.