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Resorption bone turnover marker in combined oral contraceptive (COC) users and non-COC users. Data are presented for study entry (0 months), 6, and 12 months in young females. CTX is C-terminal telopeptides. COC users have significantly greater CTX at study entry (*P = 0.02) and 6 months (#P = 0.018) compared to non-COC users
