1. From the Cardiology Clinical Academic Group, St. George’s, University of London (A.M., H.D., G.F., S.G., M.T., M.P., S.S.), the Department of Sports Medicine, Bartholomew’s and London Hospital (I.B.), and the Department of Cardiology, Imperial College NHS Trust (J.M., A.V.), London, the Football Association, Burton Upon Trent (A.M., C.C.), the Department of Cardiology, Queen Elizabeth Hospital, Birmingham (P.C.), the Department of Cardiology, Freeman Hospital, Newcastle Upon Tyne (A.K.), the Faculty of...