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