Funding for this research was provided by:
Jiangsu Science and Technology Department (BE2017762)
National Natural Science Foundation of China (31300955/C1102)
Received: 28 September 2017
Accepted: 19 February 2018
First Online: 5 March 2018
Ethics approval and consent to participate
: All subjects provided written informed consents. The study protocol was approved by the Institutional Ethical Committee of the Second Affiliated Hospital of Nanjing Medical University.
: Not applicable.
: The authors declare that they have no competing interests.
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