A prospective study of pregravid oral contraceptive use and risk of hypertensive disorders of pregnancy.
Thadhani R, Stampfer MJ, Chasan-Taber L, Willett WC, Curhan GC. A prospective study of pregravid oral contraceptive use and risk of hypertensive disorders of pregnancy. Contraception. 1999 Sep; 60(3):145-50.