“…Sixteen were between‐patient 53–56,58–66,68–70 and two were within‐patient studies 67,71 . Treatment duration ranged from 2 to 8 weeks with the majority of durations being less than 6 weeks 27,53–56,59–63,66–69,71 The number of enrolled patients varied from 42 to 1417 patients according to the trial (mean 395 patients). Criteria for success was at least 75% improvement in initial psoriasis severity in seven trials 53,54,56,59,60,63,69 and at least 90% (clear or almost clear) in seven trials 55,58,61,64,66,70,71 .…”