1. Department of Medical Administration, Daejeon Health Sciences College, Daejeon, Korea.
2. Public Health Medical Service, Seoul National University Boramae Medical Center, Seoul, Korea.
3. Department of Emergency Medicine, Seoul National University Hospital, Seoul, Korea.
4. Institute of Health Policy and Management, Medical Research Center, Seoul National University, Seoul, Korea.
5. JW LEE Center for Global Medicine, Seoul National University College of Medicine, Seoul, Korea.