“…The majority of the studies included in this review were conducted in the USA (n = 6, 28.6%) [27][28][29][30][31][32] and China (n = 6, 28.6%) [33][34][35][36][37][38], followed by Iran (n = 2, 9.5%) [39,40], South Asia (n = 2, 9.5%) [41,42], Africa (n = 1, 4.8%) [43], Australia (n = 1, 4.8%) [44], England (n = 1, 4.8%) [45], Israel (n = 1, 4.8%) [46], and Korea (n = 1, 4.8%) [47]. Retrospective cohort (n = 6) [31,34,[44][45][46][47] and case-control designs (n = 6) [30,35,38,[41][42][43] were most popular, followed by times series (n = 3) [33,39,40], prospective cohort (n = 2) [27,37], and case-crossover designs (n = 2) [28,32]. Two studies also used multiple designs to ensure robustness of findings [29,36].…”