Lv, Bohan
Zhang, Yan
Yuan, Guanghui
Gu, Ruting
Wang, Jingyuan
Zou, Yujiao
Wei, Lili
Article History
Received: 4 November 2021
Accepted: 16 February 2022
First Online: 19 March 2022
Declarations
:
: The protocol for this research project has been approved by the Medical Ethics Committee of the Affiliated Hospital of Qingdao University, with approval number QYFYWZLL25907. Because of the retrospective nature of the study, informed patient consent was waived by the Ethics Committee of the Affiliated Hospital of Qingdao University. The research conforms to the provisions of the Declaration of Helsinki (as revised in Brazil 2013).
: Not applicable.
: The authors declare that they have no competing interests.