Factors associated with contraceptive use differ between younger and older African-American female adolescents by North Clarke, Kristie Elizabeth, M.D., M.S.C.R, Kraft, Joan Marie, Ph.D, Wiener, Jeffrey B., Ph.D, Hatfield-Timajchy, Kendra, Ph.D., M.P.H, Kottke, Melissa, M.D., M.P.H., M.B.A, Sales, Jessica M., Ph.D, Goedken, Peggy, M.P.H, Kourtis, Athena P., M.D., Ph.D., M.P.H

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