1. Health Promotion Research Center, Department of Health Services, School of Public Health, University of Washington, Seattle, WA 98105, USA
2. Senior Fall Prevention Program, Washington State Department of Health, Olympia, WA 98504, USA
3. Nursing and Healthcare Leadership Program, University of Washington, Tacoma, WA 98402, USA
4. Division of Gerontology and Geriatric Medicine, Department of Medicine and Department of Health Services, School of Public Health, University of Washington, Seattle, WA 98105, USA