Ni, Ming
Zhou, Xiaoming
Liu, Jingwei
Yu, Haiyang
Gao, Yuanxiang
Zhang, Xuexi
Li, Zhiming http://orcid.org/0000-0002-8248-7953
Article History
Received: 24 August 2019
Accepted: 22 October 2020
First Online: 9 November 2020
Ethics approval and consent to participate
: This retrospective study was approved by our institutional ethics committee of The Affiliated Hospital of Qingdao University, and the informed consent was waived.
: Not applicable.
: The authors declare that they have no competing interests.