1. Saha Cardiovascular Research Center, University of Kentucky College of Medicine, Lexington, Kentucky, USA.
2. Department of Physiology, University of Kentucky College of Medicine, Lexington, Kentucky, USA.
3. Department of Medicine-Cardiology, University of Kentucky College of Medicine, Lexington, Kentucky, USA.
4. Department of Pharmacology and Nutritional Sciences, University of Kentucky College of Medicine, Lexington, Kentucky, USA.