以下为句子列表：
英文: NEW YORK (Reuters Health) - Oral contraceptive (OC) use is a risk factor for premenopausal breast cancer, according to pooled data published in the journal Mayo Clinic Proceedings.
中文: 纽约（路透社）消息――口服避孕药（OC）是绝经前女性患乳腺癌的危险因素之一，据《梅奥临床进展杂志》报道。
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英文: Overall,women who had used any oral contraceptive had a 50 percentreduction inthe risk of developing ovarian cancer than women who hadnever takenthe Pill, the investigators report.
中文: 调查人员得出的总的数据显示，服用口服避孕药的女性患卵巢癌的几率比没有服药的低50%。
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英文: The combination of levonorgestrel 0. mg and ethinylestradiol 0.0 mg as an ultra-low dosage oral contraceptive in its pilule form was studied in nine clinics in Beijing.
中文: 左旋8甲基炔诺酮0.mg与炔雌醇0.0 mg配伍的超低剂量口服避孕滴丸,98 年在北京9个医院进行临床试验。
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