1. Department of Medicine, Division of Cardiovascular Diseases, Mayo Clinic, Rochester, Minnesota.
2. Division of Geriatrics, Emory University, Atlanta, Georgia.
3. The Links, Incorporated, Washington, District of Columbia.
4. Department of Health Sciences Research, Mayo Clinic, Rochester, Minnesota.
5. Center for Clinical and Translational Science, Mayo Clinic, Rochester, Minnesota.
6. Department of Radiation Oncology, Mayo Clinic, Scottsdale, Arizona.