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Key, T, P Appleby, G Reeves, A Roddam, J Dorgan, C Longcope, F Stanczyk, et al. 2016. “Free Estradiol and Breast Cancer Risk in Postmenopausal Women: Comparison of Measured and Calculated Values.” CANCER EPIDEMIOLOGY BIOMARKERS and PREVENTION 12 (12): 1457–61.