Sharon C Reimold1, Joseph A Hill2. 1. From Departments of Internal Medicine (Cardiology) (S.C.R., J.A.H.) and Molecular Biology (J.A.H.), University of Texas Southwestern Medical Center, Dallas. 2. From Departments of Internal Medicine (Cardiology) (S.C.R., J.A.H.) and Molecular Biology (J.A.H.), University of Texas Southwestern Medical Center, Dallas. joseph.hill@utsouthwestern.edu.