[1] KAROLINSKA INST,HUDDINGE HOSP,DEPT MED,DIV CARDIOL,S-10401 STOCKHOLM 60,SWEDEN
[2] UNIV STOCKHOLM,DEPT PSYCHOL,S-10691 STOCKHOLM,SWEDEN
[3] SABBATSBERGS HOSP,DEPT CLIN PHYSIOL,S-11382 STOCKHOLM,SWEDEN
[4] KAROLINSKA INST,DEPT PHARMACOL,S-10401 STOCKHOLM 60,SWEDEN