[1] Salford Royal NHS Fdn Trust, Dermatol Ctr, Salford, Lancs, England
[2] Univ Manchester, Div Neurosci & Expt Psychol, Manchester Acad Hlth Sci Ctr, Sch Biol Sci,Fac Biol Med & Hlth, Manchester, Lancs, England
[3] NHLBI, NIH, Bldg 10, Bethesda, MD 20892 USA
[4] IDI IRCCS, Clin Epidemiol Unit, Rome, Italy
[5] Cardiff Univ, Coll Biomed & Life Sci, Sch Healthcare Sci, Cardiff, S Glam, Wales
[6] Univ Manchester, Sch Hlth Sci, NIHR Manchester Biomed Res Ctr, Manchester, Lancs, England
[7] Harvard Med Sch, Boston, MA 02115 USA
[8] Beth Israel Deaconess Med Ctr, Boston, MA 02215 USA
[9] Int Psoriasis Council, St Louis, MO USA
[10] Univ Manchester, Dermatol Ctr, NIHR Manchester Biomed Res Ctr, Manchester, Lancs, England
[11] Univ Chile, Dermatol Dept, Santiago, Chile
[12] Prob Med Res, Santiago, Chile
[13] Univ Autonoma Barcelona, Dept Dermatol, Hosp Santa Creu & St Pau, Barcelona, Spain