Funding for this research was provided by:
National Natural Sciences Foundation of China (81170747, 8167072)
Natural Science Foundation of Jiangsu Province (BK20161589)
Priority Academic Program Development of Jiangsu Higher Education Institutions (JX10231801)
Received: 10 July 2017
Accepted: 5 January 2018
First Online: 17 January 2018
Ethics approval and consent to participate
: The project was approved by the Ethical Committee of the First Affiliated Hospital of Nanjing Medical University (2011-SR-128). All subjects signed informed consent forms.
: Not applicable.
: The authors declare that they have no competing interests.
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