Text and Data Mining valid from 2019-03-21
Received: 8 October 2018
Accepted: 27 February 2019
First Online: 21 March 2019
Ethics approval and consent to participate
: Central Arkansas Veterans Healthcare System Institutional Review Board (IRB) has approved and regulates the ethical execution of this research.
: Not applicable.
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.