1. Division of Infectious Diseases & Geographic Medicine, Department of Medicine, Stanford University School of Medicine, Stanford, California, USA
2. Prematurity Research Center, Department of Pediatrics, Stanford University School of Medicine, Stanford, California, USA
3. Nutrition and Clinical Services Division, International Centre for Diarroheal Disease Research Bangladesh (icddr,b), Dhaka, Bangladesh
4. JMC Scientific Consulting Ltd, Egham, Surrey, UK
5. GlaxoSmithKline R&D, Global Health Catalyst, Stevenage, UK
6. Department of Microbiology & Immunology, Stanford University School of Medicine, Stanford, California, USA
7. Infectious Diseases Section, Veterans Affairs Palo Alto Health Care System 154T, Palo Alto, California, USA