1. From the Department of Medicine, Division of Cardiology (V.B.P., Z.W., P.Z., S.K.D., J.D.A., G.Y.O.), Mazankowski Alberta Heart Institute (V.B.P., Z.W., D.F., P.Z., R.B., S.K.D., W.W., J.D.A., Z.K., G.Y.O.), and Department of Physiology (D.F., R.B., W.W., Z.K., G.Y.O.), University of Alberta, Edmonton, AB, Canada; and National Institute of Allergy and Infectious Diseases, Bethesda, MD (S.M.H.).