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| Study | Reason for exclusion |
|---|---|
| Bernaudin 2007 | Not a RCT/quasi‐RCT |
| Hongeng 2004 | Not a RCT/quasi‐RCT |
| Horan 2005 | Not a RCT/quasi‐RCT |
| Iannone 2003 | Not a RCT/quasi‐RCT |
| Locatelli 2003 | Not a RCT/quasi‐RCT |
| Vermylen 2000 | Not a RCT/quasi‐RCT |
| Walters 1995 | Not a RCT/quasi‐RCT |
| Walters 1996 | Not a RCT/quasi‐RCT |
| Walters 2001 | Not a RCT/quasi‐RCT |
| Weinberg 2001 | Not a RCT/quasi‐RCT |
RCT: randomised controlled trial
