1. From the Department of Cardiovascular Medicine (Z.A.A., C.A.B., G.D., E.M., A.L.T., J.K.B., A.M.A., N.J.A., K.M.C.), University of Oxford, John Radcliffe Hospital, Oxford, UK; and the Sir William Dunn School of Pathology (Z.A.A., C.A.B., E.M., M.P., D.R.G.), University of Oxford, UK.