1. Dermato-Oncology Department; Nantes Hospital; 1 Place Alexis Ricordeau 44093 Nantes France
2. Bacteriological Department; Nantes Hospital; 1 Place Alexis Ricordeau 44093 Nantes France
3. Biostatistic Department; PIMES- Hôpital St Jacques; CHU Nantes; 44093 Nantes France