1. Division of Pediatric Infectious Diseases, Department of Pediatrics, Vanderbilt University School of Medicine, Nashville, Tennessee, USA
2. Department of Paediatric and Child Health, Medical College, Aga Khan University, Karachi, Pakistan
3. Division of Infectious Diseases, Vanderbilt University School of Medicine, Nashville, Tennessee, USA
4. Tennessee Valley Healthcare Systems, U.S. Department of Veterans Affairs, Nashville, Tennessee, USA
5. International Enteric Vaccine Research Program, Division of Pediatric Infectious Diseases, State University of New York at Buffalo, Buffalo, New York, USA
6. Universidad de Santander, Facultad de Ciencias Médicas y de la Salud, Instituto de Investigación Masira, Bucaramanga, Colombia