1. Division of Infectious Diseases and International Health, University of Virginia, Charlottesville, Virginia, USA
2. International Centre for Diarrhoeal Disease Research, Bangladesh (icddr,b), Dhaka, Bangladesh
3. Kenya Medical Research Institute, Center for Global Health Research (KEMRI-CGHR), Kisumu, Kenya
4. Center for Vaccine Development and Global Health, University of Maryland School of Medicine, Baltimore, Maryland, USA