1. Istituto Dermopatico dell’Immacolata IDI-IRCCS, Rome, Italy
2. Department of Dermatology, Leiden University Medical Center, Leiden, The Netherlands
3. German Cancer Research Center (DKFZ), Heidelberg, Germany
4. Centre for Cutaneous Research, Blizard Institute, Barts and the London School of Medicine and Dentistry, Queen Mary University of London, UK
5. Department of Medical Microbiology, Leiden University Medical Center, Leiden, The Netherlands
6. Department of Dermatology, Hôpital Edouard Herriot, Lyon, France
7. Department of Dermatology, Ospedali Riuniti, Bergamo, Italy
8. Queensland Institute of Medical Research, Brisbane, Australia
9. Department of Dermatology, University Hospital Charité, Skin Cancer Center Charité, Berlin, Germany
10. Institute of Virology, University of Cologne, Cologne, Germany
11. DDL Diagnostic Laboratory, Voorburg, The Netherlands