Funding for this research was provided by:
Natural Science Foundation of Hebei Province (H2018206325)
2017 clinical medicine training program of Hebei Province
Hebei Medical Science Research Project (20150631)
Article History
Received: 25 May 2020
Revised: 11 September 2020
Accepted: 1 October 2020
First Online: 15 October 2020
Compliance with Ethical Standards
:
: The authors declare that they have no conflict of interest.