1. Institute for Food Toxicology and Analytical Chemistry; University of Veterinary Medicine Hannover; Hannover Germany
2. Institute of Food Chemistry; Technische Universität Braunschweig; Braunschweig Germany
3. Department of Pathology; University of Veterinary Medicine Hannover; Hannover Germany
4. Department of Veterinary Pathobiology; Texas A&M University; College Station TX USA