“…• one randomized controlled trial, 47 • two nonrandomized controlled trials, 44,45 • four prospective cohort studies, 35,37,46,51 • two retrospective cohort studies, 34,42 • one cross-sectional cohort study, 48 • four cohort studies with preintervention and postintervention comparison, 36,40,41,53 • two descriptive studies, 32,43 and…”