1. Working Group Meat Hygiene, Institute of Food Safety and Food Hygiene, School of Veterinary Medicine, Freie Universität Berlin, 14163 Berlin, Germany
2. Veterinary Centre for Resistance Research, School of Veterinary Medicine, Freie Universität Berlin, 14163 Berlin, Germany
3. Department of Biometry, Epidemiology and Information Processing, WHO Collaborating Centre for Research and Training for Health at the Human-Animal-Environment Interface, University of Veterinary Medicine Hannover, 30559 Hannover, Germany