Sun, Yan
Huang, Tao
Lin, Jiangtao
Ge, Junbo
Bi, Benjun
Cao, Zhilin
Hong, Huanyu
Funding for this research was provided by:
Shandong medical and health science and technology development program project (2018WS033, 2018WS035)
Article History
Received: 3 August 2019
Accepted: 17 December 2019
First Online: 15 January 2020
Ethics approval and consent to participate
: This study was supported by the ethic committee of Yantaishan Hospital. Informed consent was waived by the committee because of the retrospective nature of the study.
: Not applicable.
: The authors declare that they have no competing interests.