| Study | Reason for exclusion |
|---|---|
| Ghosheh 2007 | review |
| Khaikin 2007 | retrospective controlled clinical trial |
| Levard 2001 | multicentric retrospective case series |
| Liauw 2005 | retrospective case series |
| Navez 1998 | retrospective case series |
| Neufang 2000 | retrospective case series |
| Pearl 2008 | review |
| Saribeyoğlu 2008 | retrospective case serie |
| Strickland 1999 | retrospective case series |
| Szomstein 2006 | review |
| Wullstein 2003 | retrospective controlled clinical trial |
| Zerey 2007 | retrospective case series |
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