1. National Poison Control Centre, National Institute of Public Health and Environmental Protection, P.O. Box 1, 3720 BA Bilthoven, Department of Intensive Care and Clinical Toxicology, University Hospital Utrecht, P.O. Box 85500, 3508 GA Utrecht
2. Department of Intensive Care and Clinical Toxicology, University Hospital Utrecht, P.O. Box 85500, 3508 GA Utrecht
3. TNO-Nutrition and Food Research, P.O. Box 360, 3700 AJ Zeist, The Netherlands
4. National Poison Control Centre, National Institute of Public Health and Environmental Protection, P.O. Box 1, 3720 BA Bilthoven