1. Veterinary Epidemiology Unit; Department of Reproduction, Obstetrics and Herd Health; Faculty of Veterinary Medicine; Ghent University; Ghent Belgium
2. Department of Veterinary and Animal Sciences; Faculty of Health and Medical Sciences; University of Copenhagen; Copenhagen Denmark
3. Porcine Health Management Unit; Department of Reproduction, Obstetrics and Herd Health; Faculty of Veterinary Medicine; Ghent University; Ghent Belgium
4. Danish Agriculture & Food Council; Aarhus Denmark