Published Jan. 6, 2003.

SOURCES: Charles Irwin, president, Society for Adolescent Medicine; professor of pediatrics, University of California, San Francisco; and director, Division of Adolescent Medicine, UCSF • America's Adolescents: Are They Healthy? U.S. Department of Health and Human Services, 1998 • Mary-Ann Shafer, associate director of adolescent medicine, UCSF; and professor of pediatrics and adolescent medicine, UCSF.

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