“…In total, 14 studies were included, assessing 17,680 patients treated with biologicals [9, 16, 21-23, 28, 32-35, 47, 49, 60, 62]. Ten studies were retrospective [9, 21, 28, 33-35, 47, 49, 60, 62], one was prospective [16] and the remaining 3 were post hoc analyses of RCTs [22,23,32] ( Table 2). The quality of the different studies was poor, with a median NOS of 5 (range 5-8).…”