| Study | Reason for exclusion |
|---|---|
| Maeso 2001 | Controlled trial, not randomized, case‐review study |
| Solis 2009 | Prospective, controlled trial, not randomized |
| Zamboni 1995 | Prospective, controlled trial, not randomized |
| Zamboni 1996 | Prospective, non‐controlled clinical trial |
| Zamboni 1998 | Prospective, controlled trial, not randomized |
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