[1] AKER UNIV HOSP, DEPT MED, OSLO, NORWAY
[2] AKER UNIV HOSP, DEPT PATHOL, OSLO, NORWAY
[3] ULLEVAL HOSP, NATL INST OCCUPAT HLTH, BLOOD BANK, OSLO 1, NORWAY
[4] ULLEVAL HOSP, NATL INST OCCUPAT HLTH, DEPT IMMUNOL, OSLO 1, NORWAY
[5] ULLEVAL HOSP, NATL INST OCCUPAT HLTH, DEPT CLIN CHEM, OSLO 1, NORWAY