1. Laboratory of Cutaneous Biology, Department of Dermatology, Centre Hospitalier Universitaire Vandois (CHUV), Hôpital de Beaumont, CH- 1011 Lausanne, Switzerland.
2. Department of Dermatology, University Hospital of Leiden, 2333 AA Leiden, Netherlands.
3. Municipal Dermatology Clinic, CH-8000 Zürich, Switzerland.
4. Unit of Molecular Genetics and Department of Medical Genetics, CHUV, CH-1011 Lausanne, Switzerland.