1. Department of Queen’s University School of Medicine (K.C.), Kingston, Ontario, Canada K7L 3N6
2. Department of Surgery (K.C., S.A.R., J.A.S.), Yale University School of Medicine, New Haven, Connecticut 06520
3. Department of Surgery (T.S.W.), Medical College of Wisconsin, Milwaukee, Wisconsin 53226
4. Departments of Community Health and Epidemiology and Oncology (H.D.W.), Queen’s University, Kingston, Ontario, Canada K7L 5P9