1. Department of Infectious Diseases, Children’s National Hospital, Washington, District of Columbia, USA
2. School of Medicine and Health Sciences, George Washington University, Washington, District of Columbia, USA
3. School of Medicine, Case Western Reserve University, Cleveland, Ohio, USA
4. University Hospitals Cleveland Medical Center, Cleveland, Ohio, USA
5. Pediatric Infectious Diseases, Rainbow Babies and Children’s Hospital, Cleveland, Ohio, USA
6. Milken Institute School of Public Health, George Washington University, Washington, District of Columbia, USA
7. Westat, Rockville, Maryland, USA
8. Elizabeth Glaser Pediatric AIDS Foundation, Washington, District of Columbia, USA