1. Institute of Environmental and Occupational Toxicology, Airolo, Switzerland;
2. Walther-Straub-Institut für Pharmakologie und Toxikologie, Ludwig-Maximilians-Universität, München, Germany;
3. Department of Environmental Health Sciences, School of Public Health and Tropical Medicine, Tulane University, New Orleans, LA, USA;
4. National Laboratories Inc, Detroit, MI, USA;
5. Insitutut für Pharmakologie und Toxikologie, Julius-Maximilians-Universität Würzburg, Würzburg, Germany