1. Department of Food Hygiene and Environmental Health, Faculty of Veterinary Medicine, University of Helsinki, 00350 Helsinki, Finland
2. Department of Mathematics and Statistics, Faculty of Science, University of Helsinki, 00560 Helsinki, Finland
3. Centre for Biological Threats and Special Pathogens, ZBS3—Biological Toxins, Robert Koch Institute, 13353 Berlin, Germany
4. Institute of Chemical and Biological Technology, NOVA University Lisbon, 2780-157 Oeiras, Portugal