1. From the Sussex Cardiac Centre (D.H.-S., A.J.d.B., N.C., L.B., S.H.), Brighton and Sussex University Hospitals, Brighton, United Kingdom; Southampton University Hospitals (N.P.C.), Southampton, United Kingdom; London School of Hygiene & Tropical Medicine (T.C.C.), London, United Kingdom; Golden Jubilee National Hospital (K.G.O.), Glasgow, United Kingdom; Heart and Lung Centre (J.M.C.), Wolverhampton, United Kingdom; Walsgrave Hospital (P.E.G.), Coventry, United Kingdom; King’s College Hospital ...