1. Center for Vaccine Development and Global Health, University of Maryland School of Medicine , Baltimore, Maryland , USA
2. Centre pour le Développement des Vaccins du Mali , Bamako , Mali
3. Division of Global Health Protection, Centers for Disease Control and Prevention , Nairobi , Kenya
4. Medical Research Council Unit The Gambia at the London School of Hygiene and Tropical Medicine , Banjul , The Gambia
5. Kenya Medical Research Institute, Center for Global Health Research , Kisumu , Kenya