Funding for this research was provided by:
National Natural Science Foundation of China (81672644)
Received: 11 November 2018
Accepted: 20 January 2019
First Online: 31 January 2019
Ethics approval and consent to participate
: The study protocol was approved by the Clinical Research Ethics Committee of Shengjing Hospital of China Medical University.
: Not applicable.
: The authors declare that they have no competing interests.
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