Study Selection and Data Extraction
Two reviewers (EP, GNK) conducted study selection and data extraction separately. Any discrepancies were resolved by a third reviewer (TP) through discussion and consensus. Mendeley© (v.1.19.8) was used as a reference manager, and duplicates were removed. Predefined collection forms proposed by Cochrane collaboration for Intervention Reviews 11 were used for data extraction. In case of questions about study eligibility or data provided by the studies, the paper authors were contacted.