Funding for this research was provided by:
VA Merit Award (5I01BX001989-04, I01BX001002-05)
Text and Data Mining valid from 2018-11-29
Received: 5 October 2018
Accepted: 18 October 2018
First Online: 29 November 2018
Compliance with ethical standards
: Compliance with ethical standard of VA Medical Center.
: All the authors of this manuscript have agreed to publish this article.
: No potential conflicts of interest were disclosed.