1. Department of Veterinary and Animal Sciences, University of Copenhagen, Frederiksberg, Denmark
2. Department of Biology, University of Copenhagen, Copenhagen, Denmark
3. Department of Food Science, University of Copenhagen, Frederiksberg, Denmark
4. National Food Institute, Technical University of Denmark, Lyngby, Denmark
5. Department of Pathobiology and Population Sciences, The Royal Veterinary College, Hatfield, Hertfordshire, United Kingdom