Electronic searches:
We used the following electronic databases for our search:
- MEDLINE, Ovid platform, searched from 1946 to 5 May 2021
- Embase, Ovid platform, searched from 1980 to 5 May 2021
- CINAHL, Ebsco platform, searched from 1961 to 5 May 2021
- Google Scholar, Web platform, searched on 5 May 2021