Yan, Shu http://orcid.org/0000-0001-7689-9233
Jiang, Yan
Wang, Yan
Chen, Kaixuan
Yan, Xudong
Sun, Xiaohan
Zhang, Jisheng
Article History
Received: 10 January 2021
Accepted: 9 May 2021
First Online: 24 May 2021
Declarations
:
: The authors declare that they have no conflict of interest.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the Institutional and National Research Committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. This study was approved by the Human Investigation Committee (IRB) of the Affiliated Hospital of Qingdao University, Shandong, China.
: This was a retrospective review and thus, informed consent was not required by our human ethics board.