1 Department of Dermatology , Lausanne University Hospital (CHUV), Lausanne, Switzerland and Faculty of Biology and Medicine, University of Lausanne, Lausanne, Switzerland.
2 Service and Central Laboratory of Hematology, Lausanne University Hospital (CHUV), Lausanne, Switzerland.
3 Division of Dermatology, University Hospital of Geneva, Geneva, Switzerland.
4 Department of Dermatology, Hospital 12 de octubre, Medical school, University Complutense, Madrid, Spain.