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Resources searched in following databases.
| Resources | No. hits |
|---|---|
| PubMed | 14 |
| Embase | 18 |
| Scopus | 14 |
| Web of Science | 9 |
| SveMed+ | 0 |
| Cochrane | 8 |
| TRIP database | 9 |
| ProQuest | 22 |
| EBSCOhost | 7 |
| Biotechnology research abstract | 1 |
| BMJ journal | 0 |
| BIBSYS (Oria.no) | 1 |
| AMED alternative medicine | 0 |
| Others | |
| http://Clinicaltrials.gov | 3 |
| http://Controlled-trials.com | 0 |
| http://Clinicaltrialsregister.eu | 0 |
