Funding for this research was provided by:
National Natural Science Foundation of China (81401631)
Text and Data Mining valid from 2018-10-03
Received: 21 June 2018
Accepted: 11 September 2018
First Online: 3 October 2018
Ethics approval and consent to participate
: This study was conducted in compliance with the Helsinki Declaration. The study was approved by the Medical Ethics Committee of General Navy Hospital of People’s Liberation Army.
: All participants have approved publication of the data in this manuscript.
: The authors declare that they have no competing interests.
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