The study, analyzing data from the Royal College of General Practitioners, compared half the sample of women who began taking the pill in 1968 and half who had never taken it.
这项研究分析了来自皇家全科医师协会的资料，对实例中从1968年开始服药的妇女和从未服药的妇女进行了比较。
The study, analyzing data from the Royal College of General Practitioners, compared half the sample of women who began taking the pill in 1968 and half who had never taken it.
这项研究分析了来自皇家全科医师协会的资料，对实例中从1968年开始服药的妇女和从未服药的妇女进行了比较。
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