Funding for this research was provided by:
Medical Research and Materiel Command
Received: 26 May 2019
Accepted: 27 November 2019
First Online: 13 December 2019
Ethics approval and consent to participate
: This study was approved by the Institutional Review Board at the Naval Health Research Center and all participants provided voluntary written informed consent.
: Not Applicable.
: The authors declare that they have no competing interests. I am a military service member or employee of the U.S. Government. This work was prepared as part of my official duties. Title 17, U.S.C. §105 provides that copyright protection under this title is not available for any work of the U.S. Government. Title 17, U.S.C. §101 defines a U.S. Government work as work prepared by a military service member or employee of the U.S. Government as part of that person’s official duties. Report No. 19–40 was supported by the Military Operational Medicine Research Program under work unit no. 60002. The views expressed in this article are those of the authors and do not necessarily reflect the official policy or position of the Department of the Navy, Department of Defense, nor the U.S. Government. The study protocol was approved by the Naval Health Research Center Institutional Review Board in compliance with all applicable Federal regulations governing the protection of human subjects. Research data were derived from an approved Naval Health Research Center, Institutional Review Board protocol number NHRC.2000.0007.