1. National Poison Control Centre, P.O. Box 1. 3720 BA Bilthoven, NL, Department of Intensive Care and Clinical Toxicology, University Hospital Utrecht, Utrecht, The Netherlands
2. Laboratory of Pathology P.O. Box 1. 3720 BA Bilthoven, NL
3. Laboratory of Toxicology of the National Institute of Public Health and Environmental Protection, P.O. Box 1, 3720 BA Bilthoven, The Netherlands
4. Department of Intensive Care and Clinical Toxicology, University Hospital Utrecht, Utrecht, The Netherlands