1. Department of Public Health, Yonsei Univeristy, Seoul, Korea
2. Institute of Health Services Research, Yonsei Univeristy, Seoul, Korea
3. Department of Preventive Medicine, Yonsei Univeristy College of Medicine, Seoul, Korea
4. Department of Psychiatry, Yonsei Univeristy College of Medicine, Seoul, Korea
5. Institute of Behavioral Science in Medicine, Yonsei University, Seoul, Korea