[1
]Division of General Pediatrics & Adolescent Medicine, Johns Hopkins School of Medicine,
Baltimore, Maryland.
[2
]Department of Epidemiology, Johns Hopkins Bloomberg School of Public Health, Baltimore,
Maryland.
[3
]The Adolescent Initiative, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania.
[4
]Adolescent Clinical Research, Burgess Clinic, Children's National Medical Center,
Washington, District of Columbia.
[5
]Whitman-Walker Health, Washington, District of Columbia.
[6
]Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania.