1Department of Gastroenterology and Hepatology, Sapporo Medical University, School of Medicine, Sapporo, Japan.
2Department of Internal Medicine, Korea University College of Medicine, Seoul, Korea.
3Department of Gastroenterology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.
4Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Korea.
5Department of Internal Medicine, Konyang University College of Medicine, Daejeon, Korea.
6Department of Internal Medicine, Hanyang University Guri Hosptial, Guri, Korea.
© Copyright 2016. Korean Association for the Study of Intestinal Diseases. All rights reserved.
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Financial support: This work was supported by the Japanese Society for the Promotion of Science "KAKENHI" 24590941 and supported in part by Health and Labour Sciences Research Grants for research on intractable diseases from the Ministry of Health, Labour and Welfare of Japan (Investigation and Research for Intractable Inflammatory Bowel Disease).
Conflict of interest: None.