1. Department of Internal Medicine, Gil Medical Center; Gachon University; Incheon Korea
2. Department of Internal Medicine, Samsung Medical Center; Sungkyunkwan University School of Medicine; Seoul Korea
3. Department of Pathology; Inha University School of Medicine; Incheon Korea
4. Department of Gastroenterology and Hepatology, and the National Center of Efficacy Evaluation for the Development of Health Products Targeting Digestive Disorders (NCEED); Inha University School of Medicine; Incheon Korea