1. Reproduction Unit, Department of Veterinary Medicine and Animal Productions, University of Naples Federico II, Naples, Italy.
2. Diagnostic Service of Pathology and Animal Health, Department of Veterinary Medicine and Animal Productions, University of Naples Federico II, Naples, Italy.
3. Regional Reference Center for Urban Veterinary Hygiene (CRIUV), Naples, Italy.
4. Surgery Unit, Department of Veterinary Medicine and Animal Productions, University of Naples Federico II, Naples, Italy.