1. Dermatology Department, University Hospital of Tours, Tours, France
2. Pathology Department, University Hospital of Tours, Tours, France
3. BIP (Biology of Polyomaviruses), ISP1282 INRA-University of Tours, Tours, France
4. Department of Medicine/Medical Oncology, University of Washington Medical Center, Seattle, Washington, USA
5. Clinical Research Division, Fred Hutchinson Cancer Research Center, Seattle, Washington, USA