1. Patient-Centered Clinical Research Coordinating Center, National Evidence-based Healthcare Collaborating Agency, Seoul, Korea
2. Center for Palliative Care and Clinical Ethics, Seoul National University Hospital, Seoul, Korea
3. Department of Internal Medicine, Seoul National University Hospital, Seoul, Korea
4. Department of Medical Humanities and Ethics, Hanyang University College of Medicine, Seoul, Korea
5. Department of Internal Medicine, Asan Medical Center, Seoul, Korea