Funding for this research was provided by:
National Natural Science Foundation of China (81501887)
Received: 20 April 2018
Accepted: 17 July 2018
First Online: 27 July 2018
Ethics approval and consent to participate
: The approval was obtained from the Tianjin Medical University General Hospital Ethics Review Board. Investigators have to obtain informed consent before enrolling participants in trials.
: Not applicable.
: The authors declare that they have no competing interests.
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