1. Department of Medicine, Division of Gerontology, Geriatrics and Palliative Care, Heersink School of Medicine/ School of Public Health, University of Alabama at Birmingham, Birmingham, AL, USA
2. College of Nursing, University of Utah, Salt Lake City, UT, USA
3. Department of Human Development and Family Sciences, University of Connecticut, Storrs, CT, USA
4. Department of General Internal Medicine, School of Medicine, University of Colorado Anschutz Medical Campus, Aurora, CO, USA
5. College of Nursing, University of Colorado, Aurora, CO, USA