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美国南加利福尼亚大学医学院将150名50岁以下患卵巢癌的妇女与对照组比较,发现随着活产数的增加,不完全妊娠数的增加,使用口服避孕药延续时间的增加,患卵巢癌的危险也相应减少(这些因素抑制排
United States University of Southern California School of Medicine will be 150 women under the age of 50 with ovarian cancer compared with the control group and found that with the increase in live births, incomplete increase in the number of pregnancies, the use of oral contraceptives increased duration of ovarian cancer The risks are also correspondingly reduced (these factors inhibit the row