| Study | Reason for exclusion |
|---|---|
| Ahsan 2000 | Not RCT |
| Alberty 2000 | Not RCT |
| Alfonsi 2010 | Not RCT |
| Aoyagi 2012 | Not RCT |
| Atkinson 1997 | Not RCT |
| Blitzer 1997 | Not RCT |
| Chiu 2004 | Not RCT |
| Di Pede 2012 | Not RCT |
| Dunne 1993 | Not RCT |
| Haapaniemi 2001 | Not RCT |
| Kelly 2013 | Not RCT |
| Kim 2006 | Not RCT |
| Krause 2008 | Not RCT |
| Lee 2009 | Not RCT |
| Liu 2004 | Not RCT |
| Masiero 2006 | Not RCT |
| Murry 2005 | Non RCT |
| Parameswaran 2002 | Not RCT |
| Rees 2010 | Not RCT |
| Restivo 2006 | Not RCT |
| Restivo 2011 | Not RCT |
| Restivo 2013 | Not RCT |
| Schneider 1994 | Not RCT |
| Shaw 2001 | Not RCT |
| Sjogren 2011 | Not RCT |
| Terre 2008 | Not RCT |
| Terré 2013 | Not RCT |
| Woisard‐Bassols 2013 | Not RCT |
| Zanninoto 2004 | Not RCT |
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