1. Department of Physiology and Biophysics, Mississippi Center for Heart Research, University of Mississippi Medical Center, 2500 North State St., Jackson, MS, USA
2. Research Service, G.V. (Sonny) Montgomery Veterans Affairs Medical Center, Jackson, MS, USA
3. Department of Geriatric Medicine, Translational Geroscience Laboratory, Reynolds Oklahoma Center on Aging, University of Oklahoma Health Sciences Center, Oklahoma City, OK, USA
4. Department of Pharmacology, School of Medicine, University of California, Davis, Davis, CA, USA
5. Department of Medicine, Division of Cardiology, University of Mississippi Medical Center, Jackson, MS, USA