1. Department of Medicine, University of Arizona College of Medicine, Tucson, Arizona.
2. Orthopedics and Rehabilitation, University of Vermont College of Medicine, Burlington, Vermont.
3. Geriatrics, University of Washington, Seattle, Washington.
4. Providence Alaska Medical Group, WWAMI Regional Division, University of Washington School of Medicine, Anchorage, Alaska.
5. Department of Orthopedics and Rehabilitation, University of Vermont College of Medicine, Burlington, Vermont.