1. Department of Internal Medicine, UT Southwestern Medical Center, Dallas, Texas
2. Health Sciences Digital Library and Learning Center, UT Southwestern Medical Center, Dallas, Texas
3. Division of Geriatrics and Palliative Medicine, Weill Cornell Medicine, Cornell University, New York, New York
4. Yale University School of Medicine, New Haven, Connecticut
5. Geriatric Research, Education and Clinical Center, Veterans Administration Pittsburgh Healthcare System, Pittsburgh, Pennsylvania
6. Department of Medicine, Psychiatry, Anesthesiology and Clinical & Translational Science, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania
7. Department of Medicine, VA North Texas Health Care System, Dallas, Texas, USA