[1] CATHOLIC UNIV LEUVEN,DEPT PATHOPHYSIOL,HYPERTENS & CARDIOVASC REHABIL UNIT,B-3000 LOUVAIN,BELGIUM
[2] RIJKSADM CTR,PROV GEZONDHEIDSINSPECTIE LIMBURG,HASSELT,BELGIUM
[3] ROYAL COLL SURG IRELAND,DEPT CLIN PHARMACOL,DUBLIN 2,IRELAND
[4] HAMMERSMITH HOSP,ROYAL POSTGRAD MED SCH,DEPT MED,DIV GERIATR MED,LONDON W12 0HS,ENGLAND
[5] UNIV MILAN,OSPED MAGGIORE,CTR FISIOL CLIN & IPERTENS,I-20122 MILAN,ITALY