1. Division of Gastroenterology, Department of Internal medicine, Kangbuk Samsung Hospital; Sungkyunkwan University School of Medicine; Seoul Korea
2. Department of Pathology; Sungkyunkwan University School of Medicine; Seoul Korea
3. Department of Gastroenterolgy; Sungkyunkwan University School of Medicine; Seoul Korea
4. Asan Institute for Life Sciences, Asan Medical Center; University of Ulsan College of Medicine; Seoul Korea
5. Genolution Inc.; Seoul Korea