Text and Data Mining valid from 2019-01-29
Received: 20 December 2018
Accepted: 2 January 2019
First Online: 29 January 2019
Compliance with Ethical Standards
: The authors have no conflict of interest.
: This article does not contain any studies with human participants or animals, performed by either of the authors.
: The opinions and assertions expressed herein are those of the author and are not to be construed as official or representing the views of the Department of the Navy or the Department of Defense or Southern California Permanente Medical Group.