Funding for this research was provided by:
the Key Project of Army “Twelfth Five” Scientific Research Foundation (BWS11J050)
Text and Data Mining valid from 2018-03-22
Received: 15 September 2017
Accepted: 4 March 2018
First Online: 22 March 2018
Ethics approval and consent to participate
: This study was reviewed and approved by the Ethics Committee of 309 Hospital of Chinese PLA.
: Not applicable.
: The authors declare that they have no competing interests.