1. Department of Preventive Medicine, Eulji University College of Medicine, Daejeon, Korea.
2. Department of Health Administration, College of Health Science, Dankook University, Cheonan, Korea.
3. Institute of Health Promotion and Policy, Dankook University, Cheonan, Korea.
4. Department of Medical Education, College of Medicine, Dankook University, Cheonan, Korea.