1. Department of Dermatology; University Hospital of Saint-Etienne; Saint-Etienne France
2. Department of Medical; Surgical and Neurological Science; Dermatology Section; University of Siena, S. Maria alle Scotte Hospital; Siena Italy
3. Service de Santé Publique et de l'Information Médicale; University Hospital of Saint-Etienne; Saint-Etienne France