| Study | Reason for exclusion |
|---|---|
| Belles 2014 | Not comparing intervention of interest |
| Boone 2001 | Not comparing intervention of interest |
| Fujiwara 2007 | Not comparing intervention of interest |
| Kelly 2010 | Different patient population than predefined |
| Keskintepe 2007 | Not comparing intervention of interest |
| Puelker 2010 | Different patient population than predefined |
| Sanchez 1991 | Different patient population than predefined |
| Speksnijder 2013 | Different study design, not a randomised controlled trial |
| Stoddart 2003 | Not comparing intervention of interest |
| Tretiakov 1964 | Different patient population than predefined |
| Wang 2002 | Not comparing intervention of interest |
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