[1] University of Ghent,Department of Reproduction Obstetrics and Herd Health, Unit Porcine Health Management, Faculty of Veterinary Medicine
[2] Elanco,Large Animal Clinic for Theriogenology and Ambulatory Services, Faculty of Veterinary Medicine
[3] S.A. Eli Lilly Benelux N.V.,Department of Reproduction Obstetrics and Herd Health, Veterinary Epidemiology Unit, Faculty of Veterinary Medicine
[4] University of Leipzig,undefined
[5] University of Ghent,undefined
[6] Present address: Flemish Animal Health Service (Dierengezondheidszorg Vlaanderen),undefined