Funding for this research was provided by:
The Foundation for Promotion of Defense Medicine (33026)
Text and Data Mining valid from 2020-04-24
Received: 24 April 2019
Accepted: 13 February 2020
First Online: 24 April 2020
Ethics approval and consent to participate
: The review board of the National Defense Medical College approved the study protocol (reference number: 2595).
: Not applicable.
: The authors declare that they have no competing interests.