title: Ectopic pregnancy that occurred after failure of levonorgestrel emergency contraception. Letter to the editor.
authors.forename: Kelly
authors.initials: K
authors.lastname: Cleland
authors.forename: Elizabeth
authors.initials: E
authors.lastname: Raymond
authors.forename: James
authors.initials: J
authors.lastname: Trussell
authors.forename: Linan
authors.initials: L
authors.lastname: Cheng
authors.forename: Haoping
authors.initials: H
authors.lastname: Zhu
mesh_terms: D044363:Contraception, Postcoital / Q000009:adverse effects* / Q000379:methods*; D003283:Contraceptives, Postcoital, Synthetic; D005260:Female; D006801:Humans; D016912:Levonorgestrel; D011247:Pregnancy; D011274:Pregnancy, Tubal / Q000209:etiology*
chemical_list: D003283:Contraceptives, Postcoital, Synthetic; D016912:Levonorgestrel