1. Division of Hematology-Oncology, Department of Internal Medicine, Gyeongsang National University Changwon Hospital, College of Medicine, Gyeongsang National University, Changwon, South Korea.
2. Department of Internal Medicine, College of Medicine, Gyeongsang National University, Jinju, South Korea.
3. Department of Psychiatry, College of Medicine, Gyeongsang National University, Jinju, South Korea.
4. Department of Palliative Care and Rehabilitation Medicine, MD Anderson Cancer Center, Houston, Texas.