[1] MIDDLESEX HOSP,HOLMES SELLORS CARDIOTHORAC UNIT,LONDON W1N 8AA,ENGLAND
[2] UCL HOSP,HATTER INST,DEPT ACAD & CLIN CARDIOL,LONDON,ENGLAND
[3] UCL HOSP,CTR CARDIOL,DEPT ACAD & CLIN CARDIOL,LONDON,ENGLAND
[4] MIDDLESEX HOSP,DEPT INTENS CARE MED,LONDON W1N 8AA,ENGLAND