| Affiliation: | (1) Division of Epidemiology, Statistics, and Prevention Research, Department of Health and Human Services, National Institute of Child Health and Human Development, Bethesda, MD 20895, USA;(2) The Research Triangle Institute, Rockville, MD 20852, USA;(3) The Department of Neonatology, Children's National Medical Center, 20010 Washington, DC, USA;(4) The Division of Neonatology, Georgetown University Hospital, 20007 Washington, DC, USA;(5) The International Vaccine Institute, Seoul, Korea |
