Funding for this research was provided by:
U.S. Department of Veterans Affairs (CIN 14-238, CDA 13-279, RCS 00-001)
Article History
Received: 14 September 2019
Accepted: 23 January 2020
First Online: 5 February 2020
Ethics approval and consent to participate
: Not applicable.
: Not applicable.
: The authors declare that they have no competing interests.