1 Swiss Armed Forces, Medical Services, Worblentalstrasse 36, 3063, Ittigen, Switzerland; University of Zurich, Institute for Epidemiology, Biostatistics and Prevention, Institute, Travel Clinic, Hirschengraben 84, 8001, Zürich, Switzerland.
3 University of Zurich, Institute for Epidemiology, Biostatistics and Prevention, Institute, Travel Clinic, Hirschengraben 84, 8001, Zürich, Switzerland.
4 Swiss Armed Forces, Medical Services, Worblentalstrasse 36, 3063, Ittigen, Switzerland; University of Cambridge, Department of Haematology and MRC - Wellcome Stem Cell Institute, Jeffrey Cheah Biomedical Centre, Puddicombe Way, CB2 0AW, Cambridge, United Kingdom. Electronic address: [email protected].