Total red meat intake and relative risks of overall breast cancer (highest category vs. lowest category). NHS, Nurses’ Health Study; NHSII, Nurses’ Health Study II; NIH-AARP, National Institute of Health- the American Association of Retired Persons; NYS, The New York University Women’s Health Study; PLCOCST, Prostate Lung Colorectal and Ovarian Cancer Screening Trial; SMC, Swedish Mammography Cohort.