Funding for this research was provided by:
Program for Innovation Talents in Universities of Liaoning Province (LR2016026)
Text and Data Mining valid from 2018-09-15
Received: 30 October 2017
Accepted: 4 September 2018
First Online: 15 September 2018
Ethics approval and consent to participate
: The study was approved by the Institutional Review Board of China Medical University and written informed consent was obtained from each participant.
: Not applicable.
: The authors declare that they have no competing interests.
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