1. Department of Physiology and Cell Biology, The Ohio State University Wexner Medical Center, Columbus, Ohio
2. The Dorothy M. Davis Heart and Lung Research Institute, The Ohio State University Wexner Medical Center, Columbus, Ohio
3. Division of Cardiovascular Medicine, Department of Internal Medicine, The Ohio State University Wexner Medical Center, Columbus, Ohio
4. Division of Cardiovascular Disease and Comprehensive Cardiovascular Center, University of Alabama at Birmingham, Birmingham, Alabama
5. Medical Service, Birmingham Veterans Affairs Medical Center, Birmingham, Alabama