1. Department of Pathology, School of Veterinary Medicine and Animal Science; University of Sao Paulo; Sao Paulo Brazil
2. Cancer Registry; Hospital-Based Cancer Registry of the Amaral Carvalho Foundation; Jahu Brazil
3. Department of Surgery, School of Veterinary Medicine and Animal Science; University of Sao Paulo; Sao Paulo Brazil
4. Department of Pathology, Botucatu Medical School; Sao Paulo State University; Botucatu Brazil
5. Department of Epidemiology, School of Public Health; University of Sao Paulo; Sao Paulo Brazil