Letter: Guide to steroid contraception in general practice.
D003276:Contraceptives, Oral / Q000009:adverse effects; D004338:Drug Combinations; D011307:Drug Prescriptions; D004967:Estrogens / Q000009:adverse effects; D005194:Family Practice; D005260:Female; D006801:Humans; D011372:Progestins / Q000009:adverse effects
D003276:Contraceptives, Oral; D004338:Drug Combinations; D004967:Estrogens; D011372:Progestins