1. Department of Dermatology; Leiden University Medical Centre; The Netherlands
2. DDL Diagnostic Laboratory; Rijswijk The Netherlands
3. Department of Dermatology; Roosevelt Clinic; Leiden The Netherlands
4. Virology Unit, Department of Translational Medicine; Novara Medical School; Italy
5. Division of Virology, Department of Pathology; University of Cambridge; UK
6. Department of Medical Microbiology; Leiden University Medical Centre; Leiden The Netherlands