1. Department of Laboratory Animal Center Institute of Hematology and Blood Diseases Hospital Chinese Academy of Medical Sciences and Peking Union Medical College TianjinChina
2. Department of Reproductive center Gansu Provincial Maternity and Child‐care Hospital Lanzhou, GansuChina
3. Department of Pediatrics Peking University First Hospital Beijing China
4. State Key Laboratory of Experimental Hematology Institute of Hematology and Blood Diseases Hospital Center for Stem Cell Medicine Chinese Academy of Medical Sciences and Peking Union Medical College TianjinChina