Text and Data Mining valid from 2018-05-01
Received: 13 December 2017
Accepted: 21 March 2018
First Online: 1 May 2018
Ethics approval and consent to participate
: This study was approved by National Defense Medical College Medical Ethics Committee (IRB No. 895), and we obtained consent to participate by all participants.
: Not applicable
: The authors declare that they have no competing interests.