1. Section of Interventional Cardiology, MedStar Washington Hospital Center, DC (K.R.C., A.I.A., A.K.A.-Q., A.B., P.R., I.M., A.C., W.A., D.H., L.L., F.J.R.-W., B.C.C., J.P.W., I.B.-D., L.F.S., R.W., T.R.).
2. Cardiovascular Branch, Division of Intramural Research, National Heart, Lung and Blood Institute, National Institutes of Health, Bethesda, MD (R.B., T.R.).