Funding for this research was provided by:
National Natural Science Foundation of China (81473046,31271336, 81373010, 81502868, 31401079, 81401343, 81541068)
Natural Science Foundation of Jiangsu Province (BK20130300, BK20150346)
Project of Preventive Medicine of Jiangsu Province (Y2012024)
Received: 17 January 2018
Accepted: 21 February 2018
First Online: 5 March 2018
Ethics approval and consent to participate
: The study was approved by the ethical committee of Soochow University. Subjects agreeing to participate into the present study provided a written informed consent.
: Not applicable.
: The authors declare that they have no competing interests.
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