1. Department of Neurology, Brooke Army Medical Center , Fort Sam Houston, TX, 78234 USA
2. Department of Aerospace Science, University of North Dakota , Grand Forks, ND, 58202 USA
3. Cumming School of Medicine, University of Calgary , Calgary, Alberta, T2N 4N1 Canada
4. Department of Graduate Medical Education, Brooke Army Medical Center , Fort Sam Houston, TX, 78234 USA
5. Department of Laboratory Medicine and Pathology, University of Alberta , Edmonton, Alberta, T6G 2R3 Canada
6. Innovation and Portfolio Management, Canadian Blood Services , Edmonton, AB, T6G 2R8 Canada
7. Civil Aerospace Medical Institute, Federal Aviation Administration , Oklahoma City, OK, 73169 USA