We used a data collection form for study characteristics and outcome data, which we had piloted. Two review authors (of KR, LE, DW, AV, AD, LH) extracted study characteristics and outcome data from included studies. Disagreements were resolved by consensus or by involving a third person (KR). One review author (KR) transferred data into the Review Manager software [31]. We double-checked that data were entered correctly by comparing the data presented in the systematic review with the data extraction form.
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