1. Minneapolis Veterans Affairs Health Care System, Minneapolis, MN 55417, USA
2. Department of Neuroscience, University of Minnesota Twin Cities, Minneapolis, MN 55455, USA
3. Department of Food Science and Nutrition, University of Minnesota Twin Cities, St. Paul, MN 55108, USA
4. Department of Surgery, University of Minnesota Medical School, Minneapolis, MN 55455, USA
5. Department of Biochemistry, Molecular Biology, and Biophysics, University of Minnesota Twin Cities, Minneapolis, MN 55455, USA