1. Veterans Affairs Puget Sound Health Care System, Geriatric Research, Education and Clinical Center (S-182), 1660 South Columbian Way, Seattle, WA 98108, USA
2. Group Health Research Institute, 1730 Minor Avenue, Suite 1600, Seattle, WA 98101, USA
3. Department of Biobehavioral Nursing and Health Systems, School of Nursing, University of Washington, P.O. Box 357266, Seattle, WA 98195, USA
4. Health Promotion Research Center, University of Washington, P. O. Box 357266, Seattle, WA 98195, USA