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List of electronic databases searched (31 August 2017).
| Database | Results |
|---|---|
| Medline | 1987 |
| Embase | 2352 |
| Database of Abstracts of Review and Effects (DARE) | 1 |
| Ageline | 138 |
| PsychINFO | 438 |
| CINAHL | 1555 |
| Social Services Abstracts | 47 |
| Sociological Abstracts | 77 |
| ProQuest Dissertations and Theses Global (Search conducted 5 September 2017) | 120 |
| Total | 6715 |
