| Study | Reason for exclusion |
|---|---|
| Kalita 2014 | Participants: adult population |
| Ogawa 2010 | Participants: adult population |
| Pramod 2011 | Participants: adult population |
| Ries 2003 | Participants: adult population |
| To 2002 | Participants: adult population |
| Yilmaz 2015 | Participants: adult population |
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