Table 1 Risk of bias of included trials
Study | Adepu (2010)[19] | Grant (2003)[20] | Mehuys (2011)[9] | Obreli-Neto (2011)[21] | Odegard (2005)[22] | Phumipamorn (2008)[23] |
|---|---|---|---|---|---|---|
Random generation of allocation sequence | - | - | + | - | - | + |
Allocation concealment | - | - | + | - | - | - |
Blinding of outcome assessment | - | - | - | + | - | - |
Analysis according to intention-to-treat | - | - | + | + | + | - |
Selective reporting | - | - | + | - | + | - |
Other sources of bias | + | - | + | - | - | - |