Funding for this research was provided by:
the National Natural Science Foundation of China (20803098)
Received: 15 June 2018
Accepted: 28 November 2018
First Online: 7 January 2019
Ethics approval and consent to participate
: This study was approved by the Institutional Review Board of the Scientific and Research Institute of Molecular Biology and Medicine at Chongqing Medical University (Protocol #7, January 8, 2016). We obtained written informed consent from all study participants.
: Not applicable.
: The authors declare that they have no competing interests.
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