The choice of the dose of oestrogen in a combined oral contraceptive.
D003267:Contraception; D003270:Contraceptive Agents; D003271:Contraceptive Agents, Female; D003276:Contraceptives, Oral; D003277:Contraceptives, Oral, Combined; D003278:Contraceptives, Oral, Hormonal; D004997:Ethinyl Estradiol; D005193:Family Planning Services; D016912:Levonorgestrel; D008656:Mestranol; D009640:Norethindrone
D003270:Contraceptive Agents; D003271:Contraceptive Agents, Female; D003276:Contraceptives, Oral; D003277:Contraceptives, Oral, Combined; D003278:Contraceptives, Oral, Hormonal; D004997:Ethinyl Estradiol; D016912:Levonorgestrel; D008656:Mestranol; D009640:Norethindrone
Contraception; Contraceptive Agents; Contraceptive Agents, Estrogen; Contraceptive Agents, Female; Contraceptive Agents, Progestin; Contraceptive Methods--administraction and dosage; Ethinyl Estradiol; Family Planning; Levonorgestrel; Mestranol; Norethindrone; Oral Contraceptives, Combined--administraction and dosage; Oral Contraceptives--administraction and dosage