| Study | Reason for exclusion |
|---|---|
| Bernhardt 2007 | Unsuitable study design |
| Heldmann 2000 | Unsuitable outcomes |
| Kuznetsova 2016 | Unsuitable outcomes |
| Momosaki 2014 | Unsuitable outcomes |
| Rossini 2005 | Unsuitable intervention |
| Struppler 2002 | Unsuitable study design |
| Struppler 2009 | Unsuitable study design |
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