Funding for this research was provided by:
National Natural Science Foundation of China-Yunnan Joint Fund (81230016)
China Postdoctoral Science Foundation (2016M592804)
Received: 16 September 2018
Accepted: 14 January 2019
First Online: 23 January 2019
Ethics approval and consent to participate
: The study was approved by the Human Research Ethics Committee of Xi’an Jiaotong University Health Science Center.
: Not applicable.
: The authors declare that they have no competing interests.
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