1. Department of Medicine, Division of Endocrinology, and
2. Division of Cardiology, Sarver Heart Center, Department of Medicine, University of Arizona, Tucson, Arizona; and
3. Department of Medicine, Division of Translational and Regenerative Medicine, University of Arizona College of Medicine, Tucson, Arizona
4. Pittsburgh Heart, Lung, Blood and Vascular Medicine Institute, University of Pittsburgh, Pittsburgh, Pennsylvania