“…They were carried out in ten different countries, particularly in Europe ( n = 11) [13, 14, 18, 24, 28–30, 34, 35, 38, 40], North America ( n = 24) [2, 4, 11, 12, 15–17, 19, 21–23, 25–27, 31, 33, 36, 37, 39, 41, 43–46], Asia and Pacific ( n = 4) [20, 32, 42, 47]. The overall number of transplanted patients considered was 71671.…”