1 Institute of Global Health, Faculty of Medicine, University of Geneva, 1202 Geneva, Switzerland. Electronic address: antoine.flahault@unige.ch.
2 Swiss Tropical and Public Health Institute and University of Basel, Basel, Switzerland.
3 Division of Infectious Diseases, Center for Emerging Viral Diseases, University Hospitals of Geneva and Faculty of Medicine, Geneva, Switzerland.
4 Institute of Global Health, Faculty of Medicine, University of Geneva, 1202 Geneva, Switzerland.
5 Division of Global Health Protection, National Center for Immunization and Respiratory Diseases, US Centers for Disease Control and Prevention, Kenya Medical Research Institute Headquarters, Nairobi, Kenya; Centre for Clinical Epidemiology, Division of Infectious Diseases, Lady Davis Research Institute for Medical Research, Jewish General Hospital, McGill University, Montreal, Canada.