2.2 Information sources
The studies were identified by searching the following electronic databases which include AMED (EBSCOhost), CINHAL Plus (EBSCOhost), Cochrane, Health Research Premium Collection (ProQuest), Medline (Ovid), PEDro, PsycINFO (EBSCOhost), PubMed and SPORT Discus (EBSCOhost). These databases were chosen based on their coverage of studies related to physiotherapy. Thus, systematic searches were conducted for RCTs archived in the 9 major databases and published between 1946 and May 2019.