Data Extraction and Quality Assessment
Two investigators (D.F.B and J.R) independently screened all titles,
abstracts and manually searched the full text versions of all pertinent
studies that fulfilled the inclusion criteria. References of the
relevant studies were independently reviewed for potential
identification of further studies. Two investigators (D.F.B and J.R)
independently assessed the quality items. Disagreements were resolved by
consensus. Quality assessment of all included studies was done by using
the 6 domains of the Cochrane tool for assessing risk for bias of RCTs.