Funding for this research was provided by:
Natural Science Foundation of Zhejiang Province (LQ13H190001)
Medical Science and Technology Project of Zhejiang Province (2014KYB096)
National Natural Science Foundation of China (81301459)
Received: 19 August 2017
Accepted: 20 July 2018
First Online: 31 July 2018
Ethics approval and consent to participate
: Ethical approval was granted from the Ethics Committees and review board of the First Affiliated Hospital, College of Medicine, Zhejiang University. As this study used secondary data, informed consent was not obtained from patients.
: Not applicable.
: The authors declare that they have no competing interests.
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