1. Unit Porcine Health Management, Department of Reproduction, Obstetrics & Herd Health, Faculty of Veterinary Medicine; Ghent University; Merelbeke Belgium
2. Boehringer Ingelheim Animal Health GmbH; Ingelheim Germany
3. Department of Pathology, Bacteriology and Avian Diseases, Faculty of Veterinary Medicine; Ghent University; Merelbeke Belgium