1. Center for Cohort Studies Total Healthcare Center, 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. Department of Clinical Research Design & Evaluation SAIHST, Sungkyunkwan University Seoul South Korea
4. Division of Gastroenterology and Hepatology, Department of Internal Medicine Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine Seoul South Korea
5. Department of Family Medicine Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine Seoul South Korea