“…The studies were published from 1975 to 2019. Nineteen (37%) were cohort studies, 41,44–46,48,49,52,56–59,67,71,74,82–84,86,89 16 (31%) were cross‐sectional, 22,35,39,51,60,62,64–66,69,70,73,76,77,90,91 eight (16%) were randomized control trials, 50,53–55,61,72,85,88 seven (14%) were case–control studies 43,47,68,75,78,80,87 and one (2%) was a crossover study 63 . The studies were conducted in Europe ( n = 30), 43,44,47–55,57–59,63,68,69,72–75,77,80,83–87,89,91 Asia ( n = 12), 41,56,60–62,65–67,71,76,82,83 North America ( n = 9) 22,35,39,45,46,64,70,78,90 and internationally ( n = 1) 88 .…”