“…Three studies were published more than 30 years ago [4,11,19], 10 were published between 20 and 30 years ago [5,[20][21][22][23][24]29,31,35,37], four were published between 10 and 20 years ago [28,30,38,39] and eight were published within the past 10 years [25][26][27][32][33][34]40,41]. Eighteen studies were longitudinal [4,5,11,19,21,[23][24][25][26][27][30][31][32][33][34]36,37,40], two were cross-sectional [28,39] and another two were randomized controlled trials (RCTs) [20,35].…”