1. Total healthcare center, Kangbuk Samsung Hospital, Sungkyunkwan University, School of medicine
2. Ewha Institute of Convergence Medicine, Ewha Womans University Mokdong Hospital
3. Department of Occupational and Environment Medicine, College of Medicine, Ewha Womans University
4. Department of Preventive Medicine, School of Medicine, Kyung Hee University
5. Department of Anesthesiology and Pain Medicine, Kyung Hee University Hospital
6. Department of Pediatrics, School of Medicine, Kyung Hee University
7. Department of Occupational and Environmental Medicine, Dankook University College of Medicine
8. Division of Gastroenterology and Hepatology, Department of Internal Medicine, Kyung Hee University School of Medicine
9. Department of Occupational and Environmental Medicine, School of Medicine, Kyung Hee University