[1] UNIV LEEDS,GEN INFIRM,DEPT MED,MARTIN WING,LEEDS LS1 3EX,ENGLAND
[2] NOTTINGHAM UNIV,MED SCH,PLANNING OFF,NOTTINGHAM NA7 2RD,ENGLAND
[3] UNIV COLOGNE,MED KLIN,JOSEF STELZMANN STR,S COLOGNE,WEST GERMANY
[4] ROY COLL SURG,DEPT PHARMACOL,LINCOLNS INN FIELDS,LONDON WC2,ENGLAND