“…The characteristics of the 46 included studies are described in eTable 1 (http://links.lww.com/CCX/B54). Most of the published literature was from Europe ( n = 18) (15–32), followed by Asia ( n = 12) (33–44), North America ( n = 9) (4, 45–52), South America ( n = 5) (5, 53–56), and Oceania ( n = 2) (57, 58). On the other hand, studies from North America contributed the highest number of patients ( n = 37,255), followed by South America ( n = 32,723), Asia ( n = 23,540), Europe ( n = 16,149), and Oceania ( n = 478).…”