2.3 Search strategy
The search strategy had three main terms which were extracted from the research title. They included expectations, low back pain andtreatment outcome(s) . For all databases (except PEDro and PubMed), the search terms for the three main terms were mapped to MeSH terms or subject headings whenever possible. If MeSH terms or subject headings were not available, key words within the database itself were used when possible and if not, synonyms were used. Synonyms were only used when neither MeSH terms, subject headings nor key words were available. Synonyms were only needed for the term expectations . Appendix 1 provides descriptions of all the searches conducted in each database with the number of results and the dates of each search.