Institution: | (1) Department of Toxicology, National Institute of Public Health, Geitmyrsveien 75, N-0462 Oslo 4, Norway;(2) Department of Water Hygiene, National Institute of Public Health, Geitmyrsveien 75, N-0462 Oslo 4, Norway;(3) Medical Department B, National Hospital, N-0027 Oslo 1, Norway;(4) Surgical Department B, National Hospital, N-0027 Oslo 1, Norway;(5) Institute of Occupational Health, P.O. Box 8149 Dep, N-0032 Oslo 1, Norway |