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Assessment of quality of included studies
| Study Author | Jadad score*20 |
|---|---|
| Eberhart 2003 6 | 3 |
| Tirelli 2004 7 | 1 |
| Wormald 2005 24 | 2 |
| Beule 2007 3 | 2 |
| Ahn 2008 23 | 2 |
| Yoo 2010 22 | 2 |
| Ankichetty 2011 21 | 2 |
Jadad Score is an instrument utilized to measure reduction of bias in literature, scored 0–5 (0=poor, 5= excellent)
