“…Most of the articles were performed in Brazil (40%, n = 8), 11,13,14,23‐27 followed by India (20%, n = 4) 2,28‐30 and China (10%, n = 2) 5,10 . Sixty percent of the included studies were case‐control studies, 2,5,10,12,14,19,23,29‐33 while 35% were cross‐sectional studies 11,13,24‐28 . In one case it was a prospective correlational study 17 …”