| Study | Reason for exclusion |
|---|---|
| Huang 2006 | Not RCT or CCT |
| Luciani 2008 | Not RCT or CCT, prospective open study |
| Mei‐Dan 2010 | Not RCT or CCT, open prospective study |
| Sarkin 1974 | Unclear diagnosis, unclear outcome |
| Sun 2006 | Not RCT or CCT |
| Sun 2011 | Not RCT or CCT, single arm study |
| Witteveen 2008 | Open label study, not RCT or CCT |
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