Xiao-Ying Xi1, Li Wang1, Aijun Liu2, Min-Fu Yang1. 1. Department of Nuclear Medicine, Beijing Chaoyang Hospital, Capital Medical University, Beijing, China. 2. Department of Hematology, Beijing Chaoyang Hospital, Capital Medical University, 8th Gongtinanlu Rd, Chaoyang District, Beijing, 100020, China. aijun.liu72@yahoo.com.