1. Department of Emergency Medicine, National Medical Center Seoul Republic of Korea
2. Department of Neurology Seoul National University Hospital Seoul Republic of Korea
3. Center for Palliative Care and Clinical Ethics Seoul National University Hospital Seoul Republic of Korea
4. Public Healthcare Center Seoul National University Hospital Seoul Republic of Korea
5. Department of Human Systems Medicine Seoul National University College of Medicine & Hospital Seoul Republic of Korea
6. Institute on Aging, Seoul National University College of Medicine Seoul Republic of Korea
7. Department of Pediatrics Seoul National University College of Medicine & Hospital Seoul Republic of Korea
8. Department of Medicine Seoul National University College of Medicine Seoul Republic of Korea