1. Department of Pediatrics; State Key Laboratory of Experimental Hematology; Institute of Hematology and Blood Diseases Hospital; Chinese Academy of Medical Sciences and Peking Union Medical College; Tianjin P.R. China
2. Tianjin Centers for Disease Control and Prevention; Tianjin P.R. China
3. State Key Laboratory of Experimental Hematology; Institute of Hematology and Blood Diseases Hospital; Chinese Academy of Medical Sciences and Peking Union Medical College; Tianjin P.R. China