Liu, Wenjing
Guo, Hong
Wang, Jing
Ding, Fang
Funding for this research was provided by:
Hebei Provincial Health Department
Article History
Received: 29 January 2022
Accepted: 9 June 2022
First Online: 21 June 2022
Declarations
:
: This study was conducted according to the Declaration of Helsinki and approved by institutional ethics committee board of Harrison International Peace Hospital Affiliated to Hebei Medical University. The informed written consent was waived by ethics committee board of Harrison International Peace Hospital Affiliated to Hebei Medical University because of the retrospective study design.
: Not applicable.
: The authors declare that there is no conflict of interest.