1. From the Saint Luke's Mid-America Heart Institute (A.C.S., K.J.R., S.P.M., J.A.S., M.K.), Kansas City, Mo, and University of Missouri–Kansas City School of Medicine, Kansas City, Mo; Duke Clinical Research Institute (K.P.A., T.Y.W.), Durham, NC; Denver Health Medical Center (F.A.M.), Denver, Colo; Yale University School of Medicine MD/PhD Program (S.S.R.), New Haven, Conn; and Washington University (R.G.B.), Saint Louis, Mo.