1. From the Massachusetts Department of Public Health, Jamaica Plain, Massachusetts; the
2. Children's Hospital, Boston, Massachusetts; the
3. Boston City Hospital, Boston, Massachusetts; the
4. Greater Lawrence Family Health Center, Lawrence, Massachusetts; the
5. Baystate Medical Center, Springfield, Massachusetts; the
6. University of Massachusetts Medical Center, Worcester, Massachusetts; and the
7. Division of HIV/AIDS Prevention, Centers for Disease Control and Prevention, Atlanta, Georgia.