Kris:

Here is one reference I had handy concerning uterine cancer.

Brock, K. E., "Sexual Reproductive, and Contraceptive Risk Factors for
Carcinoma-in-Situ of the Uterine Cervix in Sidney," Med. Journal of
Australia,1989

For ovarian cancer:  Schneider, A. P. "Risk Factor for Ovarian Cancer." New
England Jounal of Medicine, 1987.

Pam Wiggins, IBCLC, Franklin, VA.