1. Department of Internal Medicine, Kyung Hee University Hospital at Gangdong, Kyung Hee University College of Medicine, Seoul, Korea
2. Institute of Medical Science, Kyung Hee University Hospital at Gangdong, Seoul, Korea
3. Department of Internal Medicine, Kyung Hee University College of Medicine, Seoul, Korea
4. Department of Internal Medicine, Konyang University College of Medicine, Daejeon, Korea
5. Department of Internal Medicine, College of Medicine, The Catholic University of Korea, Seoul, Korea
6. Department of Internal Medicine, Soonchunhyang University College of Medicine, Bucheon, Korea
7. Center for Gastric Cancer, Research Institute and Hospital, National Cancer Center, Goyang, Korea
8. Department of Internal Medicine, School of Medicine, Kyungpook National University, Daegu, Korea
9. Department of Internal Medicine, Yeungnam University College of Medicine, Daegu, Korea
10. Department of Internal Medicine, Chungnam National University School of Medicine, Daejeon, Korea
11. Department of Internal Medicine, Hallym University College of Medicine, Chuncheon Sacred Heart Hospital, Chuncheon, Korea
12. Institute for Liver and Digestive Diseases, Hallym University College of Medicine, Chuncheon, Korea