1. From the Division of Nutritional Epidemiology, National Institute of Environmental Medicine, Karolinska Institutet, Stockholm, Sweden (SCL and AW); the Department of Surgery and Centre for Clinical Research, Central Hospital, Västerås, Sweden (LB); the Section of Colorectal Surgery, the Department of Surgery, University Hospital, örebro, Sweden (JR); the Departments of Nutrition and Epidemiology,