1. Centre for Pediatric Emergency Unit 1, Gansu Provincial Maternity and Child-care Hospital, Gansu Provincial Children's Medical Center, Lanzhou, Gansu 730050, China
2. Department of Neurosurgery, Gansu Provincial Maternity and Child-care Hospital, Gansu Provincial Children's Medical Center, Lanzhou, Gansu 730050, China
3. Centre for Pediatric Emergency Unit 2, Gansu Provincial Maternity and Child-care Hospital, Gansu Provincial Children's Medical Center, Lanzhou, Gansu 730050, China