1. Travel Medicine Center, Mount Auburn Hospital, Cambridge, MA, USA
2. Harvard Medical School, Faculty of Medicine, Boston, MA, USA
3. Division of Infectious Diseases and Travel Medicine, Mount Auburn Hospital, Cambridge, MA, USA
4. Epidemiology, Biostatistics and Prevention Institute, WHO Collaborating Center on Travellers’ Health, University of Zurich, Zürich, Switzerland
5. Department of Epidemiology, Human Genetics and Environmental Sciences, University of Texas School of Public Health, Houston, TX, USA