1. Department of Internal Medicine, Gyeongsang National University Changwon Hospital, Gyeongsang National University College of Medicine, Changwon, Korea
2. Division of Hematology and Oncology, Department of Internal Medicine, Chungnam National University Sejong Hospital, Chungnam National University College of Medicine, Sejong, Korea
3. Department of Internal Medicine, Gyeongsang National University Hospital, Jinju, Korea
4. Department of Internal Medicine, Gyeongsang National University College of Medicine, Jinju, Korea
5. Department of Palliative, Rehabilitation, and Integrative Medicine, the University of Texas MD Anderson Cancer Center, Houston, USA