“…As shown in Table 1 , 18 of the included studies were from Asia [ 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 ], 10 from Europe [ 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 ] and 12 from North American [ 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 , 44 ]. 23 studies (57.5%) were conducted in single center and 17 were (42.5%) multicenter.…”