Chi-Ching Chen1, Chieh-Lin Teng2, Su-Peng Yeh3,4. 1. Division of Hematology and Oncology, Department of Internal Medicine, China Medical University Hospital, 2 Yuh Der Road, Taichung, 404, Taiwan. 2. Division of Hematology and Oncology, Department of Internal Medicine, Veterans General Hospital Taichung, 1650 Taiwan Boulevard Sect. 4, Taichung, 407, Taiwan. 3. Division of Hematology and Oncology, Department of Internal Medicine, China Medical University Hospital, 2 Yuh Der Road, Taichung, 404, Taiwan. supengyeh@gmail.com. 4. China Medical University, 2 Yuh Der Road, Taichung, 404, Taiwan. supengyeh@gmail.com.