1. Departments of Cardiovascular Medicine (B.A.B., D.M.P., S.J.A.), Mayo Clinic, Rochester, MN.
2. Cardiovascular Surgery (H.V.S., A.P.), Mayo Clinic, Rochester, MN.
3. Anesthesiology (M.D.A., W.J.M.), Mayo Clinic, Rochester, MN.
4. Health Sciences Research (R.E.C.), Mayo Clinic, Rochester, MN.