1. From the Centre for Naturally Randomized Trials (B.A.F., T.B.F.), Medical Research Council, British Heart Foundation Cardiovascular Epidemiology Unit, Department of Public Health and Primary Care (B.A.F., S.B., C.O.-W., A.M.W., A.S.B., E.D.A., J.D.), Medical Research Council Biostatistics Unit (S.B.), and NIHR Blood and Transplant Research Unit in Donor Health and Genomics (A.S.B., E.D.A., J.D.), University of Cambridge, Cambridge, and Imperial Centre for Cardiovascular Disease Prevention, Department of...