| Study | Reason for exclusion |
|---|---|
| Buchler 1996 | Not a randomised controlled trial |
| Buchler 2008 | Editorial on a long‐term follow‐up report of an included study (Izbicki 1995) |
| Friess 1996 | Not a randomised controlled trial |
| Riediger 2007 | Not a randomised controlled trial |
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