1. Division of Hand, Reconstructive and Plastic Surgery, Kantonsspital St. Gallen, Rorschacherstrasse, St. Gallen 9000, Switzerland
2. Institute of Pathology, Kantonsspital St. Gallen, Rorschacherstrasse, St. Gallen 9000, Switzerland
3. Institute of Virology, Vetsuisse-Faculty, University of Zurich, Zurich, Switzerland
4. Division of Infectious Diseases and Hospital Epidemiology, Cantonal Hospital St. Gallen, Rorschacherstrasse, 95, House 22, St. Gallen 9000, Switzerland