“…Half of the studies had a sample population ranging from 501 to 1500 participants (26)(27)(28)30,31,34,(41)(42)(43)45,49,53,54,(56)(57)(58)(59)61,62,64,66) , and in all categories of data analysis, this sample size was the most frequent observed. Most longitudinal studies included in the meta-analysis investigated children aged < 6 years (28,30,40,53,57,59,60) , while children 6-19 years of age were more commonly investigated in case-control and cross-sectional studies (26,29,31,34,35,37,39,41,(44)(45)(46)48,49,52,(61)(62)(63)65,67) included in the meta-analysis and those included only in qualitative synthesis (27,…”