COX-2 Polymorphism, Use of Nonsteroidal Anti-Inflammatory Drugs, and Risk of Colon Cancer in African Americans (United States) - Leah B. Sansbury; Robert C. Millikan; Jane C. Schroeder; Kari E. North; Patricia G. Moorman; Temitope O. Keku; Allan Rene’ de Cotret; Jon Player; Robert S. Sandler (Cancer Causes & Control, 2006)