“…Half of the studies were from North America (12 from the USA, one from Canada) [31][32][33][34][35][36][37][38][39][40][41][42][43], four were from Australia [44][45][46][47], three from the Netherlands [48][49][50], two from Belgium [51, 52•] and one each from the UK [53•], Portugal [54], Spain [55] and Norway [56]. The majority of the studies (n=22) included crosssectional analyses only; four studies included a prospective design [33, 48, 49, 53•] and two included both crosssectional and prospective analyses [33,48].…”