1Department of Preventive Medicine, Seoul National University College of Medicine, Seoul, Korea
2Department of Nutritional Science and Food Management, Ewha Womans University, Seoul, Korea
3Molecular Epidemiology Branch, Division of Cancer Epidemiology and Prevention, Research Institute, National Cancer Center, Goyang, Korea
4Center for Colorectal Cancer, Research Institute and Hospital, National Cancer Center, Goyang, Korea
5Department of Surgery, Seoul National University Hospital, Seoul, Korea
Copyright © 2016 The Korean Society for Preventive Medicine
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted noncommercial use, distribution, and reproduction in any medium, provided the original work is properly cited.