题名 | Efficacy, cycle control, and side effects of low- and lower-dose oral contraceptives: a randomized trial of 20 micrograms and 35 micrograms estrogen preparations. |
作者 | Rosenberg MJ, Meyers A, Roy V. |
杂志 | Contraception. 1999 Dec;60(6):321-9. |
链接 | http://www.ncbi.nlm.nih.gov/pubmed/10715366 |
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