1. From the Department of Pediatrics, UCLA School of Medicine, Los Angeles, California;
2. Department of Pediatrics, UMD–New Jersey Medical School and Children’s Hospital of New Jersey, Newark, New Jersey;
3. Children’s Hospital Oakland, Oakland, California; and
4. Pediatric AIDS Surveillance Study, Los Angeles Pediatric AIDS Consortium, Los Angeles County Dept of Health Services, Los Angeles, California;
5. Department of Pediatrics, University of California, San Francisco School of Medicine, San Francisco, California.
6. Pediatric AIDS Foundation, Novato, California;
7. Department of Pediatrics, University of Miami School of Medicine, Miami, Florida;
8. Department of Pediatrics, Saint Vincents Hospital and Medical Center of New York, New York;