1. School of Public Health, Seoul National University
2. Department of Preventive Medicine, School of Medicine, Kyung Hee University
3. Department of Internal Medicine, School of Medicine, Kyung Hee University
4. Department of Medical Education, School of Medicine, Kyung Hee University
5. Department of Pediatrics, CHA Bundang Medical Center, CHA University School of Medicine
6. Department of Preventive Medicine, College of Medicine, Korea University