Yang, Xue
Jin, Xiangfeng
Xu, Rongjian
Yu, Zhuang
An, Ning
Article History
Received: 25 March 2021
Accepted: 8 September 2021
First Online: 21 September 2021
Declarations
:
: The authors are accountable for all aspects of the work in ensuring that questions related to the accuracy or integrity of any part of the work are appropriately investigated and resolved. The study was conducted in accordance with the Declaration of Helsinki (as revised in 2013). The study was approved by ethics board of The Affiliated Hospital of Qingdao University (NO.QYFY WZLL 25595) and individual consent for this retrospective analysis was waived.
: Not applicable.
: The authors declare that they have no competing interests.