Institution: | 1. Kids Risk Project, Harvard School of Public Health, Boston, MA, USA.;2. Centers for Disease Control and Prevention, National Center for Immunization and Respiratory Diseases, Division of Viral Diseases, Atlanta, GA, USA.;3. World Health Organization, Polio Eradication Initiative, Geneva, Switzerland.;4. Centers for Disease Control and Prevention, National Center for Immunization and Respiratory Diseases, Global Immunization Division, Atlanta, GA, USA .;5. National Polio Surveillance Project, World Health Organization, New Delhi, India. |