Text and Data Mining valid from 2018-10-31
Received: 29 May 2018
Revised: 18 July 2018
Accepted: 2 October 2018
First Online: 31 October 2018
Compliance with Ethical Standards
: The authors declare that they do not have a conflict of interest.
: The sponsor had no role in the design of the study. The views expressed in this article are those of the authors and do not necessarily reflect the position or policy of the Defense Health Agency or the US government.