1. Department of Public and Global Health, Division of Infectious Diseases, World Health Organization Collaborating Centre for Traveller’s Health, Epidemiology, Biostatistics and Prevention Institute, University of Zurich, Zurich, Switzerland
2. Division of Epidemiology, Human Genetics and Environmental Sciences, University of Texas School of Public Health, Houston, TX, USA
3. Dermatology and Venereology Outpatient Clinics, City Hospitals Waid and Triemli, Zurich, Switzerland
4. Department of Infectious Diseases and Hospital Epidemiology, University Hospital, Zurich, Switzerland