Funding for this research was provided by:
National Natural Science Foundation of China (81772888)
Received: 6 September 2018
Accepted: 6 May 2019
First Online: 16 May 2019
Ethics approval and consent to participate
: This study was approved by the university’s Institutional Review Board (Authorization No. 3–528).
: Informed written consent was obtained from each participant involved in the study.
: The authors declare that they have no competing interests.
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