• Estrogens, enzyme variants, and breast cancer: a risk model. Philip S. Crooke, Marylyn D. Ritchie, David L. Hachey, Sheila Dawling, Nady Roodi, Fritz F. Parl, 15, 9, 1620-1629, Cancer epidemiology, biomarkers & prevention : a publication of the American Association for Cancer Research, cosponsored by the American Society of Preventive Oncology, 2006 Sep, PMID: 16985022,