Yu, Xin
Yan, Yan Chun
Chen, Gang
Yu, Hong
Funding for this research was provided by:
public health bureau of Zhejiang Province ((2013KYA116))
Article History
Received: 10 September 2018
Accepted: 8 November 2018
First Online: 17 December 2018
Ethics approval and consent to participate
: This study was reviewed and approved by the institutional Ethical Board of Sir Run Run Shaw Hospital of Zhejiang University. And the need for informed consent was waived due to the retrospective nature of the study.
: Not applicable
: The authors declare that they have no competing interests.
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