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Article History

Received: 16 August 2019

Accepted: 3 May 2020

First Online: 25 May 2020

Ethics approval and consent to participate

: The study protocol was approved by the Walter Reed Army Institute of Research Institutional Review Boards and investigators adhered to the policies for protection of human subjects as prescribed in AR 70–25 and all applicable Federal regulations governing the protection of human subjects. Each study participant provided written informed consent for participation.

: Not applicable.

: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest. The opinions and assertions in this manuscript are those of the authors and are not to be construed as official as reflecting true views of the Department of Navy, Department of the Air Force, Department of the Army, Department of Defense, the Uniformed Services University of the Health Sciences, U.S. Government, the Center for Neuroscience and Regenerative Medicine or any other agency of the U.S. government. Some of the authors are military service members or employees of the U.S. Government. This work was prepared as part of their official duties. Title 17 U.S.C. §105 provides that ‘Copyright protection under this title is not available for any work of the United States Government.’ Title 17 U.S.C. §101 defines a U.S. Government work as a work prepared by a military service member or employee of the U.S. Government as part of that person’s official duties. Material has been reviewed by the Walter Reed Army Institute of Research. There is no objection to its presentation and/or publication.