1. Division of Infectious Diseases; Department of Internal Medicine; Kangbuk Samsung Hospital; Sungkyunkwan University School of Medicine; Seoul South Korea
2. Department of Occupational and Environmental Medicine; Kangbuk Samsung Hospital; Sungkyunkwan University School of Medicine; Seoul South Korea
3. Center for Cohort Studies; Total Healthcare Center; School of Medicine; Kangbuk Samsung Hospital; Sungkyunkwan University; Seoul South Korea
4. Department of Clinical Research Design & Evaluation; SAIHST; Sungkyunkwan University; Seoul South Korea
5. Department of Internal Medicine; Yonsei University College of Medicine; Seoul South Korea
6. Division of Gastroenterology and Hepatology; Department of Internal Medicine; Kangbuk Samsung Hospital; Sungkyunkwan University School of Medicine; Seoul South Korea