title: Emergency contraception: how effective is it?
mesh_terms: D003267:Contraception; D003270:Contraceptive Agents; D003271:Contraceptive Agents, Female; D003276:Contraceptives, Oral; D003281:Contraceptives, Postcoital; D005069:Evaluation Studies as Topic; D005193:Family Planning Services; D007434:Intrauterine Devices; D007435:Intrauterine Devices, Copper; D012106:Research
chemical_list: D003270:Contraceptive Agents; D003271:Contraceptive Agents, Female; D003276:Contraceptives, Oral; D003281:Contraceptives, Postcoital
keywords: Comparative Studies; Contraception; Contraceptive Agents; Contraceptive Agents, Female; Contraceptive Agents, Postcoital; Contraceptive Effectiveness; Contraceptive Methods; Family Planning; Fertility Control, Postcoital; Iud; Iud, Copper Releasing; Oral Contraceptives; Research Methodology; Research Report; Studies; Use-effectiveness