Search sources.
| Sources to be searched | |
| 1 | MEDLINE |
| 2 | EMBASE |
| 3 | CINAHL |
| 4 | DARE |
| 5 | ASSIA |
| 6 | Web of Science |
| 7 | ZETOC |
| 8 | AMED |
| 9 | NHS Digital (HSCIC) |
| 10 | NHS Evidence (public domain only) |
| 11 | DH |
| 12 | NICE Guidelines |
| 13 | Cochrane Database of Systematic Reviews |
| 14 | EPPI-CENTRE |
| 15 | SCOPUS |
| 16 | Google Scholar |
| 17 | OpenGrey |
| 18 | Greynet sources |
| 19 | ProQuest dissertations and theses |
| 20 | General Medical Council |
| 21 | Royal College of Physicians |
| 22 | Local Medical Committees (West Midlands) |
| 23 | Clinical Commissioning Groups (West Midlands) |
| 24 | SIGN |