1. Geriatric Research Education and Clinical Center, VA Bedford Healthcare System, Bedford, Massachusetts, USA
2. Department of Occupational Therapy, Tufts University, Medford, Massachusetts, USA
3. Department of Psychology, Tufts University, Medford, Massachusetts, USA
4. Department of Community Health, Tufts University, Medford, Massachusetts, USA
5. Department of Neurology, Harvard Medical School, Boston, Massachusetts, USA