1. Department of Infectious Diseases and Hospital Epidemiology, University Hospital Zurich, 8091 Zurich, Switzerland
2. Institute of Medical Virology, University of Zurich, 8006 Zurich, Switzerland
3. Center for Infectious Diseases, Klinik im Park, 8027 Zurich, Switzerland
4. Department of Infectious Diseases, Hospital Epidemiology and Occupational Health, City Hospital Zurich, 8091 Zurich, Switzerland
5. Checkpoint Zurich, 8005 Zurich, Switzerland