Funding for this research was provided by:
Hebei Provincial Department of Human Resources and Social Security (NO A201903007)
Received: 26 December 2019
Accepted: 22 July 2020
First Online: 31 July 2020
Ethics approval and consent to participate
: This study was approved by the ethics committee of the 3rd hospital of Hebei Medical University. Informed consent was obtained from all the participants.
: Written informed consent was obtained from each patient to authorize the publication of their data.
: The authors declare that they have no competing interests.