Analysis of information sources in references of the Wikipedia article "奎孕酮" in Chinese language version.
She had been taking an oral contraceptive combining ethinylestradiol and quingestrone since 1980.
She had been taking an oral contraceptive combining ethinylestradiol and quingestrone since 1980.
She had been taking an oral contraceptive combining ethinylestradiol and quingestrone since 1980.