Study/year | Study design | Tool | Quality score |
---|---|---|---|
Chiang 2012 | RCT | a | 7 |
Yang 2010 | RCT | a | 7 |
Karpman 2009 | RCT | a | 7 |
Kim 2007 | RCT | a | 4 |
Chin 2007 | RCT | a | 7 |
Huang 2016 | Retrospective | b | 7 |
Qi 2016 | Retrospective | b | 7 |
Shen 2007 | Retrospective | b | 8 |
Huang 2007 | Retrospective | b | 7 |
King 2007 | Retrospective | b | 8 |
Tashiro 2007 | Retrospective | b | 7 |
Chen 2006 | Retrospective | b | 7 |
Kim 2006 | Retrospective | b | 8 |