Table 1.

Literature search strategies

Strategy	Definition
1) Search instrument by name	Full instrument name entered into each search engine.
2) Search instrument by acronym	Acronym(s) entered into each search engine.
3) Search by source article identification	Source article name/reference entered into each search engine.
4) Search by source article “cited by” feature	Source article entered into Google Scholar and “cited by” feature was used.
5) Search for grey literature	Instrument searched in Google to identify grey literature.