1. Department of Medicine (R.M.S.), Mayo Clinic, Rochester, MN.
2. Department of Cardiovascular Medicine (N.Y.T., Y.-M.C., S.M.D.), Mayo Clinic, Rochester, MN.
3. Department of Quantitative Health Sciences (J.M.K.), Mayo Clinic, Rochester, MN.
4. Robert D. and Patricia E. Kern Center for the Science of Health Care Delivery (S.M.D.), Mayo Clinic, Rochester, MN.