1. Research Service, Birmingham VA Health Care System, Birmingham, AL 35233, USA
2. Healthspan, Resilience & Performance, Florida Institute for Human and Machine Cognition, Pensacola, FL 32502, USA
3. Department of Cell, Developmental, and Integrative Biology, University of Alabama-Birmingham, Birmingham, AL 35294, USA
4. Department of Exercise Science and Pre-Health Professions, Creighton University, Omaha, NE 68178, USA
5. School of Medicine, Creighton University, Omaha, NE 68178, USA
6. Spinal Cord Damage Research Center, Bronx, NY 10468, USA
7. Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA
8. Medical Service, James J. Peters VA Medical Center, Bronx, NY 10468, USA