Funding for this research was provided by:
National Natural Science Foundation of China (No.81700829)
Fundamental Research Funds for the Central Universities
Received: 24 January 2018
Accepted: 20 June 2018
First Online: 3 July 2018
Ethics approval and consent to participate
: Ethical approval was obtained from the Medical College of Zhejiang University and Fenghua people’s hospital Ethics Review Board. The study adhered to the tenets of the Declaration of Helsinki.
: Not applicable.
: The authors declare that they have no competing interests.
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