1 Division of Infectious Diseases, Department of Public Health, Epidemiology, Biostatistics and Prevention Institute, WHO Collaborating Center for Traveller's Health, University of Zurich, Zurich, Switzerland Division of Epidemiology, Human Genetics & Environmental Sciences, The University of Texas School of Public Health, Houston, Texas, USA roste@ifspm.uzh.ch.
2 Department of Global Health and Population, Harvard T.H. Chan School of Public Health, Boston, Massachusetts, USA Global Health Sciences, University of California San Francisco, California, USA.