1. Department of General Pediatrics, Boston Medical Center, Boston, Massachusetts.
2. Division of Adolescent and Behavioral Health, University of Texas Medical Branch at Galveston, Texas.
3. Division of Adolescent Medicine, Indiana University, Indianapolis, Indiana.
4. Department of Biostatistics, University of Cincinnati, Ohio.
5. Division of Infectious Diseases, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio.
6. Division of Adolescent Medicine, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio.