1 Department of Dermatology, University Hospital of Basel, Basel, Switzerland.
2 Department of Pathology, University Hospital of Basel, Basel, Switzerland.
3 Department of Dermatology, University Hospital of Basel, Basel, Switzerland; Department of Dermatology, Venerology, and Allergology, Kantonsspital St Gallen, St Gallen, Switzerland; University of Zurich, Zurich, Switzerland. Electronic address: [email protected].