[1] Hosp Clin Barcelona, Serv Reumatol, Barcelona, Spain
[2] IDIBAPS, Barcelona, Spain
[3] Hosp Univ La Princesa, IIS Princesa, Serv Dermatol, Madrid, Spain
[4] Univ Hosp, Cent Asturias, Serv Reumatol, Oviedo, Spain
[5] TAISS, Madrid, Spain
[6] TAISS, Serv Dermatol, Madrid, Spain
[7] Hosp Badalona Germans Trias & Pujol, Serv Dermatol, Badalona, Spain
[8] Hosp Univ Doctor Negrin Palmas Gran, Serv Dermatol, Canaria, Spain
[9] Hosp Univ Basurto, Serv Reumatol, Bilbao, Spain
[10] Hosp Univ Fdn Alcorcon, Serv Dermatol, Madrid, Spain
[11] Hosp Univ Salamanca, Serv Reumatol, Salamanca, Spain
[12] Hosp Univ Bellvitge, Hosp Lobregat, Serv Reumatol, Barcelona, Spain
[13] Hosp Santa Creu & Sant Pau, Serv Dermatol, Barcelona, Spain