Assessment of Methodological Quality
Two review authors (N.W and M.M.) independently assessed the quality of studies using the AMSTAR quality assessment tool. Scores were tracked using Microsoft Excel (Redmond, Wash.). Review authors selected either “yes,” “no,” “not applicable,” or “can’t answer” for each of the 11 AMSTAR criteria. Differences in the assessment were resolved by consensus with the primary author. One point was given to a study for each of the 11 AMSTAR criteria that received a “yes,” while no points were awarded for “no,” “not applicable,” or “can’t answer”. Thus, the highest total score possible was 11 (Table S3 Pg. 4-6).