1. ECVAM, JRC Environment Institute, 21020 Ispra (VA), Italy
2. National Institute of Public Health and the Environment, 3720 BA Bilthoven, The Netherlands
3. Field Laboratories, Medical School, University of Sheffield, Beech Hill Road, Sheffield S10 2RX, UK
4. BIBRA International, Woodmansterne Road, Carshalton, Surrey SM5 4DS, UK
5. Pfizer Central Research, Sandwich, Kent CT13 9NJ, UK
6. SmithKline Beecham Pharmaceuticals, New Frontiers Science Park (North), Third Avenue, Harlow, Essex CM19 5AW, UK
7. Merck Sharp & Dohme Research Laboratories, Neuroscience Research Centre, Terlings Park, Harlow, Essex CM20 2QR, UK