1. Department of General Practice, Faculty of Medicine, University of Nantes, Nantes, France;
2. French National Institute of Health and Medical Research (INSERM U892)/National Center for Scientific Research (CNRS U6299), Team 2, Nantes, France;
3. Oncodermatology Department, Nantes University Hospital, Nantes, France;
4. Department of Epidemiology and Biostatistics, Nantes University Hospital, Nantes, France;
5. Medical Department of the French Health Insurance System, Nantes, France