Parity and breastfeeding among African-American women: Differential effects on breast cancer risk by estrogen receptor status in the Women's Circle of Health Study

Christine B. Ambrosone, Gary Zirpoli, Melanie Ruszczyk, Jyoti Shankar, Chi Chen Hong, Demetra McIlwain, Michelle Roberts, Song Yao, Susan E. McCann, Gregory Ciupak, Helena Hwang, Thaer Khoury, Lina Jandorf, Dana H. Bovbjerg, Karen Pawlish, Elisa V. Bandera