1. Department of Medicine, University of Washington Medical Center, Seattle, WA, USA
2. University of Iowa, Iowa City, IA, USA
3. Sticht Center on Aging, Department of Internal Medicine, Wake Forest University School of Medicine, Winston-Salem, NC, USA
4. VA Puget Sound Healthcare System, Seattle, WA, USA
5. Alzheimer’s Disease Cooperative Study, Department of Neurosciences, University of California San Diego, La Jolla, CA, USA