1. Department of Surgery, Radiology and Anesthesiology, Faculty of Veterinary Medicine Damanhour University Damanhour Behera Egypt
2. Department of Molecular and Biomedical Sciences, College of Veterinary Medicine North Carolina State University Raleigh North Carolina USA
3. Department of Clinical Sciences North Carolina State University Raleigh North Carolina USA
4. Large Animal Clinical Sciences University of Tennessee College of Veterinary Medicine Knoxville Tennessee USA