title: Prospective study of contraception with levonorgestrel.
authors.forename: T
authors.initials: T
authors.lastname: Chernev
authors.forename: S
authors.initials: S
authors.lastname: Ivanov
authors.forename: I
authors.initials: I
authors.lastname: Dikov
authors.forename: R
authors.initials: R
authors.lastname: Stamenkova
mesh_terms: D001519:Behavior; D002031:Bulgaria; D003267:Contraception; D003270:Contraceptive Agents; D003271:Contraceptive Agents, Female; D003281:Contraceptives, Postcoital; D019049:Developed Countries; D005060:Europe; D005061:Europe, Eastern; D005193:Family Planning Services; D016912:Levonorgestrel; D010349:Patient Compliance; D011446:Prospective Studies; D012106:Research
chemical_list: D003270:Contraceptive Agents; D003271:Contraceptive Agents, Female; D003281:Contraceptives, Postcoital; D016912:Levonorgestrel
keywords: Behavior; Bulgaria; Contraception; Contraceptive Agents; Contraceptive Agents, Female; Contraceptive Agents, Female--side effects; Contraceptive Agents, Postcoital--side effects; Contraceptive Agents, Progestin; Contraceptive Agents--side effects; Contraceptive Effectiveness; Developed Countries; Eastern Europe; Europe; Family Planning; Levonorgestrel; Prospective Studies; Research Methodology; Studies; User Compliance