“…The remaining 25 (81%) of studies were case reports that included one patient each. Of the 31 studies included, 9 (29%) were published in the United States, 14,15,[17][18][19][20][21][22][23] 7 (23%) in the United Kingdom, 9,18,24-28 6 (19%) in Japan, 16,[29][30][31][32][33] and 1 from each of the following countries: Germany, 34 Ireland, 35 Iran, 36 Scotland, 37 Australia, 38 India, 39 Israel, 40 Italy, 41 and Canada. 4 Regarding risk of bias among the 7 cohort studies, 2 studies (33%) received <5 points, while 5 studies (67%) received !5 points, indicating the majority of cohort studies had a low risk of bias.…”