Caro JJ, Johannes CB, Hartz SC, Marrs R, Miettinen OS. Re: characteristics relating to ovarian cancer risk; collaborative analysis of twelve US case-control studies. II. Invasive epithelial ovarian cancers in white women. Letter to the editor. Am J Epidemiol. 1993 Apr 15;137(8):978. doi: 10.1093/oxfordjournals.aje.a116754