Funding for this research was provided by:
The Science & Technology Project of Hunan Province (2018SK2135, 2018SK2135)
The Key Laboratory of Emergency Medicine for Children (NA)
Ministry of Science and Technology in Hunan Provincial of China (2018TP1028)
The Pediatric Critical Care Center of Hunan Key Construction Specialty (NA)
Received: 13 October 2019
Accepted: 19 August 2020
First Online: 31 August 2020
Ethics approval and consent to participate
: The study protocol was reviewed and approved by the Medical Ethics Committee of the Hunan Children’s Hospital (HCHLL-2019-40). Informed consent was waved because of the retrospective design. The authors had no access to information that could identify individual participants during and after data collection.
: Not applicable.
: The authors declare that they have no competing interests.