4FDA. The adverse event reporting system (AERS) : lasted quarterly data files[EB/OL], http: //www.fda.gov/Drugs/ GuidanceComplianceReegulatorylnformation/Surveillance/ ucm082193.2010-08.
5Ghosh B, Dadhwal V, Daka D. Ectopic pregnancy fol- lowing levonorgestrel emergency contraception: a case report [J]. Contraception, 2009,79(2) : 155.
6Tanchev S, Shentov B. Emergency contraception with le- vonorgestrel in adolesce- nts[J]. Akush Ginekol (Sofiia), 2004,43 (Suppl 3) : S41.
7Horga A, Santamarina E, Quilez A. Cerebral venous thr- ombosis associated with repeated use of emergency con- traception[J]. EurJNeurol, 2007,14(4):5.
8No authors listed. Efficacy and side effects of immediate postcoital levonorgestrel used repeatedly for contraception [J]. Contraception, 2000,61 ( 5 ) : 303.
