A 12 percent reduction equated to one fewer case of cancer for every 2,200 women who used the pill for a year, the study published by the British Medical Journal showed.

的降低等同于每2200位女性服药超过一年就减少一例癌症发生，这一研究发表在英国医学杂志。

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A 12 percent reduction equated to one fewer case of cancer for every 2,200 women who used the pill for a year, the study published by the British Medical Journal showed.

的降低等同于每2200位女性服药超过一年就减少一例癌症发生，这一研究发表在英国医学杂志。

youdao