Cheng Zhang1, Xing-Hua Chen1, Xi Zhang2. 1. Department of Hematology, Xinqiao Hospital, Third Military Medical University, Chongqing, 400037, People's Republic of China. 2. Department of Hematology, Xinqiao Hospital, Third Military Medical University, Chongqing, 400037, People's Republic of China. Electronic address: zhangxxi@sina.com.