2 Dermatology Department, Hospital de Santo António dos Capuchos-Centro Hospitalar de Lisboa Central, Lisboa, Portugal.
3 Dermatology Department, Hôpital Edouard Herriot, Lyon, France.
4 Department of Dermatology, Venereology and Allergology, University Hospital Wuerzburg, Joseph-Schneider- Str. 2, 97080 Wuerzburg, Germany.
5 Dermatology Department, Hospital Universitario San Pedro, Logroño (La Rioja), Spain.
6 Department of Dermatology and Venereology, Hôpital de Beaumont, Lausanne University Hospital Center, Av. de Beaumont 29, CH-1011 Lausanne, Switzerland.