1. Department of Health Policy and Management, Graduate School of Public Health; Yonsei University; Seoul Korea
2. Institute of Health Services Research; Yonsei University; Seoul Korea
3. Department of Public Health Administration; Namseoul University; Cheonan-si Chungcheongnam-do Korea
4. Department of Preventive Medicine, College of Medicine; Yonsei University; Seoul Korea
5. Department of Public Health, Graduate School; Yonsei University; Seoul Korea