Family history increases the risk of colorectal cancer: Fuchs CS, Giovanucci EL, Colditz GA, Hunter DJ, Speizer FE, Willett WC (Channing Laboratory Department of Medicine, Brigham and Women's Hospital and Harvard Medical School, Boston; Division of Medical Oncology, Dana-Farber Cancer Institute, Boston; and Department of Epidemiology, Environmental Health and Nutrition, Harvard School of Public Health, Boston, Massachusetts). A prospective study of family history and the risk of colorectal cancer. N Engl J Med 1994; 331:1669–1674 (December 22, 1994)