1. Division of Cardiology, Department of Medicine, Duke University Medical Center, Duke University School of Medicine, Durham, North Carolina.
2. Division of Cardiology, Department of Medicine, Center for Advanced Cardiac Care, Columbia University Medical Center, New York, New York.
3. Division of Gerontology, Geriatrics and Pallative Care, University of Alabama-Birmingham and Section of Pallative Care, Birmingham VA Medical Center, Birmingham, Alabama.