[1] Med Univ Vienna, Dept Dermatol, Div Special & Environm Dermatol, A-1090 Vienna, Austria
[2] Leiden Univ Ctr, Dept Dermatol, NL-2300 RC Leiden, Netherlands
[3] Univ Aquila, Dept Dermatol, I-67100 Laquila, Italy
[4] Med Ctr Minden, Dept Dermatol, Minden, Germany
[5] Hop Avicenne, Dermatol Serv, F-93009 Bobigny, France
[6] Hop Avicenne, Unite Hematol, F-93009 Bobigny, France
[7] Ctr Hosp & Univ, Serv Dermatol, Clermont Ferrand, France
[8] Helsinki Univ Hosp, Dept Dermatol & Venereal Dis, Helsinki, Finland
[9] Univ Florence, Sch Med, Dept Dermatol Sci, Florence, Italy
[10] Hosp 12 Octubre, Serv Dermatol, E-28041 Madrid, Spain
[11] Univ Zurich Hosp, Dept Dermatol, CH-8091 Zurich, Switzerland
[12] Univ Barcelona, IDIBAPS, Hosp Clin, Serv Dermatol, Barcelona, Spain
[13] St Thomas Hosp, St Johns Inst Dermatol, Skin Tumour Unit, London SE1 7EH, England