“…The search strategy yielded 13 eligible studies for inclusion in this review. 8,11,18,24,27,31,33,35,38,53,[56][57][58] After checking their reference lists, 8 additional studies were eligible. 3,20,30,33,34,36,46,60 This resulted in 21 studies, of which 18 prospective cohort studies 3,11,18,20,30,31,[33][34][35][36][37]39,38,46,[56][57][58]60 and 3 randomized controlled trials.…”