Article History
Received: 7 November 2017
Accepted: 25 January 2018
First Online: 20 February 2018
Compliance with ethical standards
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: The views expressed herein are those of the authors and do not reflect the official policy or position of Brooke Army Medical Center, the US Army Medical Department, the US Army Office of the Surgeon General, the Department of the Army, the Department of the Air Force, the Department of Defense, or the US Government.