1. Cincinnati Children's Hospital Medical Center and the University of Cincinnati College of Medicine; Cincinnati Ohio
2. New York University School of Medicine; New York New York
3. Westat; Rockville Maryland
4. Maternal and Pediatric Infectious Disease Branch, Eunice Kennedy Shriver National Institute of Child Health and Human Development; National Institutes of Health; Rockville Maryland
5. Wayne State University; Detroit Michigan
6. Ohio State University; Columbus Ohio