Funding for this research was provided by:
Hebei Provincial Health Commission (20191770)
Received: 9 October 2020
Accepted: 31 December 2020
First Online: 25 January 2021
Compliance with Ethical Standards
: The authors declare that they have no conflict of interest.
: The study was approved by the Ethical Review Committee of Cangzhou Central Hospital.
: Each informed consent was acquired.