1. National Environmental Protection Board, Products Control Division, P.O. Box 1302, S-171 25 Solna, Sweden
2. Institute of Biology and Chemistry, University of Roskilde, P.O. Box 260, DK-4000 Roskilde, Denmark
3. Cytotoxicology Laboratory, Uppsala-CTLU, P.O. Box 622, S-751 26 Uppsala, Sweden
4. NIOM, Scandinavian Institute of Dental Materials, Forskningsvägen 1, N-0371 Oslo 3, Norway
5. Department of Toxicology, National Institute of Public Health, N-0462 Oslo 4, Norway
6. Research Department, National Board of Occupational Safety and Health, S-171 84 Solna, Sweden
7. Department of Anatomy, Institute of Biomedicine, University of Turku, Kiinamyllynkatu 10, SF-20520 Turku 52, Finland
8. Unit of Neurochemistry and Neurotoxicology, University of Stockholm, Enköpingsvägen 126, S-172 46 Sundbyberg, Sweden