1. Novartis Institute for Tropical Diseases, 5300 Chiron Way, Emeryville, California 94608, United States
2. Bill and Melinda Gates Foundation, 440 5th Ave N, Seattle, Washington 98109, United States
3. Blizard Institute, Barts and The London School of Medicine, Queen Mary University of London, Turner Street, London E1 2AD, United Kingdom
4. Tropical Gastroenterology and Nutrition group, University of Zambia School of Medicine, Nationalist Road, Lusaka, Zambia