Table 3 Cochrane’s risk of bias
Source of bias | Random sequence generation | Allocation concealment | Blinding of participants and personnel | Blinding of outcome assessment | Incomplete outcome data | Selective reporting | Other source of bias |
|---|---|---|---|---|---|---|---|
Ling (2003)[33] | U | U | U | U | L | U | U |
Ramachandran (2004)[34] | U | U | U | U | L | U | U |
Derosa (2004)[35] | U | U | U | U | L | U | U |
Gonzolez (2004)[36] | U | L | L | L | L | U | U |
Rong (2004)[22] | U | U | U | U | L | U | U |
Tang (2004)[37] | U | U | U | U | L | U | U |
Yamanouchi (2005)[20] | L | L | L | U | L | U | U |
Ning (2006)[38] | U | U | U | U | L | U | U |
Wu (2007)[39] | U | U | U | U | L | U | U |
Xu (2007)[40] | U | U | U | U | L | U | U |
Li (2007)[41] | U | U | U | U | L | U | U |
Wang (2009)[21] | U | U | U | U | L | U | U |
Rahman (2011)[42] | U | U | U | U | L | U | U |
Yoon (2011)[21] | U | U | U | U | L | U | U |
Wang (2011)[43] | U | U | U | U | L | U | U |