Table S1.
Initial literature search results on the 16th of July, 2013
| Total | After deduplication | |
|---|---|---|
| Embase | 624 | 614 |
| Medline OvidSP | 604 | 214 |
| Web-of-Science | 646 | 293 |
| Cochrane | 5 | 0 |
| Total | 1879 | 1121 |
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