“…Our search identified 2418 unique titles and 30 studies met inclusion criteria (Supporting Information S2: Figure S1 for PRISMA flow diagram; n = 280 864, Supporting Information S1: Table S1). 15,16,23–50 The majority of studies were prospective cohort studies ( n = 17); there were six prospective cross‐sectional studies, three retrospective studies, two case control studies, one study described as “comparative,” and one study described as “prospective descriptive longitudinal study.” Included studies were conducted in 19 different countries with 12 (40%) completed in Asia, 6 (20%) conducted in Africa as well as Europe, 5 (17%) in North America, and 1 (0.3%) in South America. 12 (40%) of studies were multi‐centre.…”