1. Division of Gastroenterology, Department of Internal Medicine, Daejeon Veterans Hospital, Daejeon, Korea
2. Department of Internal Medicine, Chungnam National University School of Medicine, Daejeon, Korea
3. Division of Gastroenterology, Department of Internal Medicine, Chungnam National University Hospital, Daejeon, Korea
4. Division of Disaster Statistics, Department of Fire and Disaster Prevention, Daejeon University, Daejeon, Korea
5. Division of Gastroenterology, Department of Internal Medicine, Chungnam National University Sejong Hospital, Sejong, Korea