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.
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