1. College of Veterinary Medicine; Western University of Health Sciences; Pomona California
2. Department of Small Animal Surgery, Faculty of Veterinary Medicine; Cairo University; Cairo Egypt
3. Département des Sciences Cliniques, Faculty of Veterinary Medicine; University of Montreal; Saint-Hyacinthe Quebec Canada
4. Department of Veterinary Clinical Medicine, College of Veterinary Medicine; University of Illinois; Urbana-Champaign Illinois