Adolescents' social class identification and conceptualization of class: Implications for health: E. Goodman, MD, B.C. Amick, PhD, M.O. Rezendes, PhD, S. Levine, PhD, A.R. Tarlov, MD, W. R. Rogers, PhD, and J. Kagan, PhD. Children's Hospital, and New England Medical Center, Boston, MA, and Harvard University, Cambridge, MA