1. Department of Medicine and Epidemiology School of Veterinary Medicine University of California Davis California USA
2. Red de Biología y Conservación de Vertebrados Instituto de Ecología Xalapa México
3. Department of Surgical and Radiological Sciences School of Veterinary Medicine University of California Davis California USA
4. William R. Pritchard Veterinary Medical Teaching Hospital School of Veterinary Medicine University of California Davis California USA