1. Department of Child and Adolescent Psychiatry, Children's Memorial Hospital, Chicago, Illinois.
2. Center for Biostatistics in AIDS Research and the Department of Biostatistics, Harvard School of Public Health, Boston, Massachusetts.
3. Department of Neuropsychology, Kennedy Krieger Institute, Baltimore, Maryland.
4. Department of Neurosciences, University of California, San Diego, California.
5. Department of Pediatrics, Tulane University School of Medicine, New Orleans, Louisiana.
6. François-Xavier Bagnoud Center, School of Nursing, University of Medicine and Dentistry of New Jersey, Newark, New Jersey.
7. Department of Pediatrics, University of Maryland School of Medicine, Baltimore, Maryland.
8. Department of Psychiatry, Children's Hospital Boston, Boston, Massachusetts.