title: Emergency contraception and risk of ectopic pregnancy: is there need for extra vigilance?
authors.forename: David R
authors.initials: DR
authors.lastname: Vinson
mesh_terms: D003281:Contraceptives, Postcoital / Q000009:adverse effects*; D016903:Drug Monitoring / Q000379:methods*; D005060:Europe / Q000453:epidemiology; D005260:Female; D006801:Humans; D015994:Incidence; D016912:Levonorgestrel / Q000009:adverse effects*; D009520:New Zealand / Q000453:epidemiology; D011247:Pregnancy; D011271:Pregnancy, Ectopic / Q000139:chemically induced* / Q000453:epidemiology; D011358:Product Surveillance, Postmarketing; D012307:Risk Factors; D006113:United Kingdom / Q000453:epidemiology; D014481:United States / Q000453:epidemiology
chemical_list: D003281:Contraceptives, Postcoital; D016912:Levonorgestrel