1. Department of Health Administration and Management, College of Medical Science, Soonchunhyang University, Asan, Korea
2. Department of Public Health, Yonsei University College of Medicine, Seoul, Korea
3. Institute of Health Services Research, Yonsei University College of Medicine, Seoul, Korea
4. Department of Hospital Administration, Graduate School of Public Health, Yonsei University, Seoul, Korea
5. Department of Preventive Medicine, Yonsei University College of Medicine, Seoul, Korea