Quality assessment based on the Newcastle-Ottawa Scale of studies included in this meta-analysisa.
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aA study can be awarded a maximum of one star for each numbered item except for the item Control for important factor or additional factor.bA maximum of two stars can be awarded for Control for important factor or additional factor.Quality assessment based on the Newcastle-Ottawa Scale of studies included in this meta-analysisa.
创建时间：
2015-12-03
