1. Divisions of General Internal Medicine, University of Alabama at Birmingham, Birmingham, Alabama, USA.
2. Divisions of Hematology and Oncology, University of Alabama at Birmingham, Birmingham, Alabama, USA.
3. College of Medicine, University of South Alabama, Mobile, Alabama, USA.
4. Division of Gerontology, Geriatrics, and Palliative Care, and University of Alabama at Birmingham, Birmingham, Alabama, USA.
5. O'Neal Comprehensive Cancer Center, University of Alabama at Birmingham, Birmingham, Alabama, USA.