1. Laboratory for Ethology, Department of Nutrition, Genetics and Ethology, Faculty of Veterinary Medicine; Ghent University; Merelbeke East-Flanders Belgium
2. Veterinary Epidemiology Unit, Department of Reproduction, Obstetrics and Herd Health, Faculty of Veterinary Medicine; Ghent University; Salisburylaan Belgium
3. Integrated Veterinary Research Unit (IVRU), Department of Veterinary Medicine, Faculty of Sciences; University of Namur; Namur Belgium
4. Virology, Department of Infectious and Parasitic Diseases, FARAH Centre, Faculty of Veterinary Medicine; University of Liège; Liège Belgium