Xu, Liyan
Wang, Yan http://orcid.org/0000-0001-9096-5479
Article History
Received: 13 December 2020
Accepted: 19 May 2021
First Online: 5 June 2021
Declarations
:
: We have no financial and personal relationships with other person or organizations that can inappropriately influence our work. We have no conflict of interest.
: The approval for the study was obtained from the ethics committee of the affiliated hospital of Qingdao university.