[1] UNIV OSLO HOSP, RIKS HOSP, INST PATHOL, OSLO 1, NORWAY
[2] NORWEGIAN RADIUM HOSP, DEPT CLIN CHEM, OSLO 3, NORWAY
[3] NHLI, HYPERTENSION ENDOCRINE BRANCH, BETHESDA, MD 20014 USA
[4] RIKS HOSP OSLO, INST SURG RES, OSLO 1, NORWAY
[5] UNIV OSLO, INST PHYSIOL, OSLO 1, NORWAY