1. Department of Medical Oncology, St. Vincent's Hospital, College of Medicine, Catholic University of Korea, Suwon, Korea.
2. Hospice and Palliative Care Unit, St. Vincent's Hospital, College of Medicine, Catholic University of Korea, Suwon, Korea.
3. Department of Pulmonology, St. Vincent's Hospital, College of Medicine, Catholic University of Korea, Suwon, Korea.