Tan, Qiang http://orcid.org/0000-0003-1621-4428
Wang, Qingsheng
Yang, Hongmei
Jing, Zhang
Ming, Chen
Funding for this research was provided by:
Hebei medical technology project ((20171252))
Article History
Received: 25 June 2020
Accepted: 6 October 2020
First Online: 1 January 2021
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest statement.
: This study was approved by the ethics committee of Qinhuangdao First Hospital. This study was carried out conforming to the principles expressed in the Declaration of Helsinki.
: For this type of study, formal consent is not required.