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, U.S.A
3
Dermatology and Venereology Outpatient Clinics, City Hospitals Waid and Triemli, Zurich, Switzerland
4
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
5
Department of Infectious Diseases and Hospital Epidemiology, University Hospital, Zurich, Switzerland
✉To whom correspondence should be addressed. Prof. Robert Steffen, M.D., UZH / EBPI, Hirschengraben 84, CH-8001 Zurich / Switzerland. robert.steffen@uzh.ch; Mobile: +41 79 292 7832; Fax: +41 44 910 8949
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