Letter: Side effects of oral contraceptives.
D003276:Contraceptives, Oral / Q000009:adverse effects*; D004338:Drug Combinations; D004997:Ethinyl Estradiol / Q000008:administration & dosage*; D005260:Female; D006801:Humans; D045167:Progesterone Congeners / Q000008:administration & dosage*
D003276:Contraceptives, Oral; D004338:Drug Combinations; D045167:Progesterone Congeners; D004997:Ethinyl Estradiol