| Database | No. of records retrieved | Potentially eligible | Included | Date searched |
| PubMed | 432 | 0 | 0 | 2014‐05‐28 |
| EMBASE | 319 | 0 | 0 | 2014‐05‐27 |
| CENTRAL | 55 | 0 | 0 | 2014‐05‐28 |
| NHS Economic Evaluations Database | 0 | 0 | 0 | 2014‐05‐28 |
| Cochrane Drug and Alcohol Specialised Register | 0 | 0 | 0 | 2014‐05‐28 |
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