1. Departments of Cardiovascular Medicine (S.V., C.J., L.C.), Heart and Vascular Institute, Cleveland Clinic, OH.
2. Thoracic and Cardiovascular Surgery (S.M., A.M.G., T.M., D.M.C., L.S.), Heart and Vascular Institute, Cleveland Clinic, OH.
3. Department of Mathematics, Cleveland State University, OH (Y.W.).