title: [A comparative clinical study of the effects of three types of low-dose estrogen/progestogen oral contraceptives].
authors.forename: J K
authors.initials: JK
authors.lastname: Chen
mesh_terms: D001695:Biology; D003267:Contraception; D003268:Contraception Behavior; D003270:Contraceptive Agents; D003271:Contraceptive Agents, Female; D003276:Contraceptives, Oral; D003277:Contraceptives, Oral, Combined; D003278:Contraceptives, Oral, Hormonal; D004703:Endocrine System; D004997:Ethinyl Estradiol; D005193:Family Planning Services; D006728:Hormones; D016912:Levonorgestrel; D008597:Menstrual Cycle; D008598:Menstruation; D009640:Norethindrone; D010827:Physiology; D012098:Reproduction; D012102:Reproductive Control Agents; D012106:Research
chemical_list: D003270:Contraceptive Agents; D003271:Contraceptive Agents, Female; D003276:Contraceptives, Oral; D003277:Contraceptives, Oral, Combined; D003278:Contraceptives, Oral, Hormonal; D006728:Hormones; D012102:Reproductive Control Agents; D004997:Ethinyl Estradiol; D016912:Levonorgestrel; D009640:Norethindrone
keywords: Biology; Clinical Research; Comparative Studies; Contraception; Contraception Continuation; Contraceptive Agents; Contraceptive Agents, Estrogen; Contraceptive Agents, Female; Contraceptive Agents, Progestin; Contraceptive Methods; Contraceptive Usage; Endocrine System; Ethinyl Estradiol; Family Planning; Hormones; Levonorgestrel; Menstrual Cycle; Menstruation; Norethindrone; Oral Contraceptives; Oral Contraceptives, Combined; Oral Contraceptives, Phasic; Physiology; Reproduction; Reproductive Control Agents; Research Methodology; Studies