1. Department of Veterinary Medical Imaging and Small Animal Orthopaedics, Faculty of Veterinary Medicine, Ghent University, Merelbeke, Belgium
2. Gluck Equine Research Center, Department of Veterinary Science, University of Kentucky, Lexington, KY, USA
3. Theriogenology Department, Faculty of Veterinary Medicine, University of Mansoura, Mansoura, Egypt
4. Veterinary Diagnostic Laboratory, Department of Veterinary Science, University of Kentucky, Lexington, KY, USA
5. Department of Morphology, Faculty of Veterinary Medicine, Ghent University, Merelbeke, Belgium