1. Animal Science Post-Graduate Program; Federal University of Piauí; Campus Ministro Petrônio Portella Teresina Piauí 64049-550 Brazil
2. Graduate of Veterinary Medicine; Federal University of Piauí; Campus Ministro Petrônio Portella Teresina Piauí 64049-550 Brazil
3. Health Department Clinics; State University of Maranhão; Campus Paulo VI São Luís Maranhão 65055-310 Brazil
4. Department of Morphophysiology; Federal University of Piauí; Campus Ministro Petrônio Portella Teresina Piauí 64049-550 Brazil
5. Department of Small Animal Clinical Sciences; College of Veterinary Medicine, University of Florida; Gainesville Florida 32610
6. Surgery Post-Graduate Program; Federal University of Ceará, Avenida Da Universidade; Fortaleza Ceará 60020-181 Brazil
7. Department of Morphology and Animal Physiology; Federal University of Pernambuco; Recife Pernambuco 52171-900 Brazil
8. Department of Clinical and Veterinary Surgery; Federal University of Minas Gerais; Belo Horizonte Minas Gerais 30161-970 Brazil