Li, Xiaoli
Ma, Qianli
Tao, Cheng
Liu, Jinling
Nie, Pei
Dong, Cheng https://orcid.org/0000-0003-1903-2291
Article History
Received: 12 April 2021
Revised: 7 July 2021
Accepted: 8 July 2021
First Online: 15 July 2021
Declarations
:
: The authors declare that they have no conflict of interest.
: This retrospective study was approved by the Institutional Review Board of the Affiliated Hospital of Qingdao University and Qingdao Municipal Hospital.
: The requirement for informed consent was waived due to the retrospective nature of the study.
: All authors consent to publication. No other consents were required or sought.