1. Department of Geriatric Hematology and Oncology, Guangzhou First People's Hospital, Guangzhou, China
2. Department of Hematology and Oncology, Cancer Center of Sun Yat-sen University, Guangzhou, China
3. Department of Hematology, Zhujiang Hospital of Southern Medical University, Guangzhou, China
4. Department of Hematology, Kanghua Hospital, Dongguan, China