Hua Bai1, Peipei Xu2, Bing Chen3. 1. The Affiliated Drum Tower Hospital of Nanjing University Medical School, Department of Hematology, Nanjing 210008, China. Electronic address: baihua92@126.com. 2. The Affiliated Drum Tower Hospital of Nanjing University Medical School, Department of Hematology, Nanjing 210008, China. 3. The Affiliated Drum Tower Hospital of Nanjing University Medical School, Department of Hematology, Nanjing 210008, China. Electronic address: chenbing2004@126.com.