[1] UNIV OSLO, INST NUTR RES, POB 1046, OSLO 3, NORWAY
[2] KAROLINSKA INST, HUDDINGE HOSP, RES CTR, S-10401 STOCKHOLM 60, SWEDEN
[3] KAROLINSKA INST, HUDDINGE HOSP, DEPT CLIN CHEM, S-10401 STOCKHOLM 60, SWEDEN
[4] NATL HOSP NORWAY, PEDIAT RES INST, OSLO 1, NORWAY
[5] NORWEGIAN RADIUM HOSP, OSLO 3, NORWAY
[6] NORSK HYDROS INST CANC RES, OSLO 3, NORWAY
[7] BUSKERUD CENT HOSP, N-3000 DRAMMEN, NORWAY
[8] LAB ELECTRONMICROSCOPY & MORPHOMETRY, OSLO, NORWAY