“…Four studies had a prospective longitudinal design [26,29,39,36], one was a cross-sectional study with a retrospective measure of the exposure factor (henceforth treated as retrospective) [5], and 16 were crosssectional studies [9, 23-25, 27, 29-35, 37, 6, 38, 40, 28, 41]. A total of 7 studies were conducted in Asia [24,25,27,30,33,39,40], 6 in Europe [9,26,31,32,35,36], 3 in South America [28,29,6], 3 in North America [23,34,5], one in Oceania [38] and one study included a multinational sample [37].…”