Funding for this research was provided by:
National Natural Science Foundation of China (81601653)
Received: 24 October 2018
Accepted: 18 January 2019
First Online: 31 January 2019
Ethics approval and consent to participate
: Written informed consent was obtained from all subjects and/or patient guarantors. The study was approved by the Ethics Committee of China Medical University.
: Not applicable.
: The authors declare that they have no competing interests.
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