| Study | Reason for exclusion |
|---|---|
| Barbaro 2006 | Case‐control trial |
| Borget 2008 | Case‐control trial |
| Duntas 2007 | Case‐control trial |
| Jarzab 2003 | Consecutive series of patients |
| Luster 2005 | Case‐control trial |
| Montesano 2007 | Case‐control trial |
| Pacini 2002 | Case‐control trial |
| Papadimitriou 2006 | Non‐randomised prospective controlled clinical trial |
| Robbins 2002 | Case control trial |
| Rosario 2008 | Non‐randomised prospective controlled clinical trial |
| Tuttle 2008 | Case‐control trial |
| Wong 2009 | Case‐control trial |
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