1. Department of Nutrition, National Food Institute, Technical University of Denmark, Søborg, Denmark,
2. Department of Nutrition, National Food Institute, Technical University of Denmark, Søborg, Denmark
3. Department of Veterinary Diagnostics and Research, Section for Epidemiology, National Food Institute, Technical University of Denmark, Søborg, Denmark
4. Department of Microbiology and Risk Assessment, Danish Zoonosis Centre, National Food Institute, Technical University of Denmark, Søborg, Denmark