“…Three studies [ 14 , 15 , 16 ] did not show data on persistence or the number of persistent patients, while one did not show data on adherence [ 17 ]; two studies were conducted on patients not only affected by psoriasis [ 18 , 19 ] and did not report adherence data for psoriasis patients; one study [ 20 ] did not report the number of patients treated with each biological drug but only adherence as percentage. Fifty-five studies [ 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 , 44 , 45 , 46 , 47 , 48 , 49 , 50 , 51 , 52 , 53 , 54 , 55 , 56 , 57 , 58 , 59 , 60 , 61 , 62 , 63 , 64 , 65 , 66 , …”