Funding for this research was provided by:
National Natural Science Foundation of China (81471647, 81571748)
Received: 17 October 2017
Accepted: 29 June 2018
First Online: 9 August 2018
Ethics approval and consent to participate
: The study was approved by the Southwest Hospital Ethics Committee (reference number, 2016-Scientific-Research-No.50), and all the participants provided written informed consent.
: The authors declare that they have no competing interests.
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