| Study | Reason for exclusion |
|---|---|
| Akman‐Demir 1996 | No control group. |
| Benamour 2006 | No control group. |
| Borhani Haghighi 2011 | No control group. |
| Desbois 2012 | No control group. |
| Dutra 2011 | No control group. |
| Essaadouni 2010 | No control group. |
| Farah 1998 | No control group. |
| Ideguchi 2010 | No control group. |
| Krupa 2011 | No control group. |
| Saadoun 2009 | No control group. |
| Sbai 2003 | Control group was not described with sufficient detail to allow assessment of potential 'confounding by indication'. |
| Serdaroğlu 1989 | No control group. |
| Tohmé 2009 | No control group. |
| Wechsler 1992 | No control group. |
| Whallett 1999 | No control group. |
| Yesilot 2007 | No control group. |
| Yesilot 2009 | No control group. |
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