[1] UNIV GOTEBORG,SAHLGRENS HOSP,DEPT CLIN PHARMACOL,S-41310 GOTEBORG,SWEDEN
[2] UNIV N CAROLINA,SCH MED,DEPT ANESTHESIOL,CHAPEL HILL,NC 27514
[3] UNIV N CAROLINA,SCH MED,DEPT PHARMACOL,CHAPEL HILL,NC 27514
[4] UNIV N CAROLINA,SCH MED,DEPT ANAT,CHAPEL HILL,NC 27514