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What is the effect on ovarian activity of a preceding intake of ulipristal acetate (UPA) when starting a combined oral contraceptive (COC) in the mid- to late-follicular phase of the cycle?

human reproduction

The effects on ovarian activity of ulipristal acetate when 'quickstarting' a combined oral contraceptive pill: a prospective, randomized, double-blind parallel-arm, placebo-controlled study