Michels, K. ., Pfeiffer, R. ., Brinton, L. ., & Trabert, B. . (2018). Modification of the Associations Between Duration of Oral Contraceptive Use and Ovarian, Endometrial, Breast, and Colorectal Cancers. JAMA Oncology. https://doi.org/10.1001/jamaoncol.2017.4942 (Original work published 2018)