1. Department of Obstetrics and Gynecology; University of Southern California School of Medicine; Los Angeles; CA; USA
2. Skaggs School of Pharmacy and Pharmaceutical Sciences; University of California San Diego; La Jolla; CA; USA
3. Children's Hospital; Boston; MA; USA
4. Statistical and Data Analysis Center; Harvard School of Public Health; Boston; MA; USA
5. Pediatric, Adolescent, and Maternal AIDS Branch; Eunice Kennedy Shriver National Institute of Child Health and Human Development; Bethesda; MD; USA
6. Frontier Science and Technology Research Foundation; Amherst; NY; USA
7. The Children's Hospital; Aurora; CO; USA
8. National Institute of Allergy and Infectious Diseases; Bethesda; MD; USA
9. Department of Pediatrics; University of California San Diego, Rady Children's Hospital San Diego; San Diego; CA; USA
10. Boston University School of Medicine; Boston; MA; USA