Miao, Wenjie
Nie, Pei
Yang, Guangjie
Wang, Yangyang
Yan, Lei
Zhao, Yujun
Yu, Ting
Yu, Mingming
Wu, Fengyu
Rao, Wei
Wang, Zhenguang
Article History
Received: 2 January 2021
Accepted: 21 March 2021
First Online: 4 April 2021
Declarations
:
: All procedures performed on human participants were in accordance with the ethical standards of the Institutional Research Committee of the Affiliated Hospital of Qingdao University (Approval No. QYFY WZLL 25649) and the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
: Informed consent was waived for this retrospective study.
: The authors declare no competing interests.