[1] ST JAMES HOSP, DEPT CARDIOL, CREST DIRECTORATE, DUBLIN 8, IRELAND
[2] IRISH HEART FDN, COUNCIL ACUTE CORONARY CARE, BALLSBRIDGE, DUBLIN, IRELAND
[3] ST VINCENTS HOSP, DEPT PREVENT MED, DUBLIN, IRELAND
[4] MEATH HOSP, DEPT CARDIOL, DUBLIN, IRELAND
[5] ADELAIDE HOSP, DEPT CARDIOL, DUBLIN, IRELAND
[6] UNIV COLL DUBLIN, DEPT EPIDEMIOL & PUBL HLTH, DUBLIN, IRELAND
[7] CLEVELAND CLIN FDN, DEPT ELECTROPHYSIOL, CLEVELAND, OH 44195 USA
[8] CHARLEMONT CLIN, CHARLEMONT, ARMAGH, NORTH IRELAND