“…We included 26 studies [21,] that fulfilled all search criteria (see Table 1 for summary of studies). The studies were based in the following countries: USA (12 studies) [21,35,38,41,43,48,[50][51][52][53][54][55], UK (3 studies) [39,44,46], Australia (2 studies) [40,49], and 1 each in Canada [47], China [59], Greece [36], Holland [45], Italy [56], Japan [58], New Zealand [57], Turkey [37] and Taiwan [42]. Six studies [38,40,48,51,52,56] recruited separate exposed and unexposed samples and the remaining studies were cross-sectional designs.…”