1. Division of Cardiovascular Disease and Comprehensive Cardiovascular Center, University of Alabama at Birmingham (S.S.B., M.A.I., M.G., G.Z., G.R., T.H., S.D.P.).
2. The current affiliation for S.S.B. is Department of Physiology and Cell Biology, The Dorothy M Davis Heart & Lung Research Institute, Ohio State University Wexner Medical Center, Columbus.
3. Medical Service, Birmingham VAMC, AL (S.D.P.).