1 Institute of Medical Microbiology and Hygiene, Saarland University, Homburg/Saar, Germany; Department of Epidemiology and Public Health, Swiss Tropical and Public Health Institute, Basel, Switzerland; University of Basel, Basel, Switzerland. Electronic address: soeren.becker@uks.eu.
2 Department of Dermatology, Saarland University, Homburg/Saar, Germany.
3 Service d'anatomie pathologique, Laboratoire national de santé, Dudelange, Luxembourg.
4 Department of Dermatology, Saarland University, Homburg/Saar, Germany. Electronic address: cornelia.mueller@uks.eu.