Jick H, Walker AM, Rothman KJ. Vaginal spermicides and congenital disorders - the validity of a study-reply. JAMA. 1986 Jan 1;256(22):3095-6.
Jick H, Hannan MT, Stergachis A, Heidrich F, Perera DR, Rothman KJ. Vaginal spermicides and gonorrhea. JAMA. 1982 Jan 1;248(13):1619-21.