Hua Pan1, Liang Song2, Li-Rong Sun3. 1. Academic Foundation Year 8 Doctor, Department of Emergency Paediatrics, Affiliated Hospital of Qingdao University, Qingdao, China. 2. Academic Foundation Year 10 Doctor, Department of Pediatric Intensive Care Unit, Affiliated Hospital of Qingdao University, Qingdao, China. 3. Professor of Clinical Hematology, Department of Pediatric Hematology, Affiliated Hospital of Qingdao University, Qingdao, Shandong 266003, China.