1. INSERM U563, Purpan Hospital, Place du Dr Baylac, BP 2028, 31034 Toulouse CEDEX 3 and Université Paul Sabatier, 31062 Toulouse, France
2. Department of Dermatology, University of California, 4150 Clement Street, San Francisco, CA 94131, USA
3. Department of Medical Genetics, Purpan Hospital, Place du Dr Baylac, 31059 Toulouse CEDEX 3, France
4. Dermatology Service, Department of Veterans Affairs Medical Center, 4150 Clement Street, San Francisco, CA 94131, USA