1. Department for Farm Animals and Veterinary Public Health, University of Veterinary Medicine, Vienna, Veterinärplatz 1, 1210 Vienna, Austria.
2. Lower Austrian district government (veterinary services), Frauenhofner Str. 2, 3580 Horn, Austria.
3. Austrian Agency for Food Safety and Nutrition Ltd., Spargelfeldstrasse 171, 1220 Vienna, Austria.