Text and Data Mining valid from 2018-02-08
Received: 20 October 2017
Revised: 19 December 2017
Accepted: 16 January 2018
First Online: 8 February 2018
Compliance with Ethical Standards
: The study was approved by the Corporal Michael J. Crescenz VA Medical Center institutional review board, including a waiver of informed consent.
: The views expressed in this article are those of the authors and do not necessarily represent the position or policy of the Department of Veterans Affairs or the US Government.
: The authors declare that they do not have a conflict of interest.