Funding for this research was provided by:
Key Research and Development Program of Hebei Province Self-funded (172777186)
Medical Science Research Project of Hebei Province in 2019 (20190933)
Baoding Social Development (18ZF290)
Received: 30 June 2019
Accepted: 5 December 2019
First Online: 13 December 2019
Ethics approval and consent to participate
: I confirm that I have read the Editorial Policy pages. This study was conducted with approval from the Ethics Committee of our hospital. This study was conducted in accordance with the declaration of Helsinki. Written informed consent was obtained from all patient Guardians.
: Not applicable.
: The authors declare that they have no competing interests.