Letter: Vitamins and oral contraceptive use.
D000749:Anemia, Megaloblastic / Q000139:chemically induced; D003276:Contraceptives, Oral / Q000009:adverse effects* / Q000494:pharmacology; D005260:Female; D005492:Folic Acid / Q000097:blood*; D005494:Folic Acid Deficiency / Q000139:chemically induced; D006801:Humans
D003276:Contraceptives, Oral; D005492:Folic Acid