[1] STATE UNIV LEIDEN HOSP,2333 AA LEIDEN,NETHERLANDS
[2] UNIV AMSTERDAM,ACAD MED CTR,DEPT PHARMACOTHERAPY & CARDIOL,1105 AZ AMSTERDAM,NETHERLANDS
[3] STATE UNIV LEIDEN HOSP,DEPT NEPHROL & HYPERTENS,2333 AA LEIDEN,NETHERLANDS
[4] F HOFFMANN LA ROCHE & CO LTD,DEPT CLIN RES,CH-4002 BASEL,SWITZERLAND