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二级参考文献2
1Mortola L Jr, Girton L,Yan SS .Depressive epsodes in premenstrual syndrome,.Am J Obstet Gynecol ,1993,169:295-303.
2Parsey HS, Pong A.An open-label,multicenter study to evaluate Yasmin, a low dose combination oral contraceptive containing drospirnone, a new progestogen.Contraception ,2000,61: 105-111.
