机构:[1]Childrens Hosp Eastern Ontario, Ottawa, ON K1H 8L1, Canada;[2]Nanfang Hosp, Guangzhou, Peoples R China;[3]Beijing Union Med Coll Hosp, Beijing, Peoples R China;[4]Beijing Childrens Hosp, Beijing, Peoples R China;首都医科大学附属北京儿童医院[5]Tianjin Inst Hematol & Blood Dis Hosp, Tianjin, Peoples R China