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Depot medroxyprogesterone acetate (Depo Provera ® ) is a popular contraceptive method among adolescents. Little is known, however, about the long term effects of Depo Provera ® on bone mineral density in adolescent females. This ongoing study prospectively evaluates the effects of Depo Provera ® and oral contraceptive pills on bone mineral density, compared to normally menstruating...