Int. J. Hyg. Environ. Health 207 (2004); 391 397 http://www.elsevier.de/intjhyg Scientific Comment J. Muttera, J. Naumanna, C. Sadaghiania, H. Walacha, G. Draschb a Institute for Environmental Medicine and Hospital Epidemiology, University Hospital, Freiburg, Germany b Institute of Forensic Medicine, Ludwig-Maximilian