Funding for this research was provided by:
Agricultural Research Service (3062-51000-051-00D)
Received: 6 August 2019
Accepted: 30 October 2019
First Online: 21 November 2019
Ethics approval and consent to participate
: The study protocol was approved by the Institutional Review Board of the University of North Dakota and all participants provided informed written consent.
: Not applicable.
: WG and IE hold patents on the reflection technology and are with Longevity Link Corporation, the maker of the instrumentation used in this study The other authors declare that they have no competing interests.