Letter: Vitamin E status and oral contraceptives.
D000349:Africa; D044383:Black People; D003276:Contraceptives, Oral / Q000009:adverse effects*; D005260:Female; D006801:Humans; D014810:Vitamin E / Q000097:blood*; D044465:White People
D003276:Contraceptives, Oral; D014810:Vitamin E