1. Dermatology and Allergy; University Hospital of Nancy; rue du Morvan 54511 Vandoeuvre-les-Nancy France
2. Dermatology; University of Angers; Rue Larrey 49100 Angers France
3. Dermatology; Regional Hospital of Metz-Thionville; rue du Friscaty 57100 Thioville France
4. Dermatology; University Hospital of Dijon; rue Gaffarel 21079 Dijon France
5. Dermatology; University Hospital of Montpellier; Avenue du Doyen Gaston Giraud 34090 Montpellier France
6. Laboratory for Statistics; University Hospital of Nancy; rue du Morvan 54511 Vandoeuvre-les-Nancy France