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测定延长应用口服避孕药(OC)时间,即口服OC超过21 d或缩短停药时间减少激素撤退症状的频率及严重性。 方法:延长应用OC(如延长应用6,9或12周)或延长至
Determination of prolonged use of oral contraceptives (OC) time, that oral OC for more than 21d or shorten the withdrawal time to reduce the frequency and severity of hormone withdrawal symptoms. Methods: Extend the application of OC (such as extending the application of 6,9 or 12 weeks) or extended to