1. Department of Veterinary Medicine; University of Perugia; Perugia Italy
2. Department of Veterinary Sciences; University of Pisa; SanPiero a Grado, Pisa Italy
3. CeSDA - Centro di Studio sul Dolore Animale; University of Perugia; Perugia Italy
4. Pharmacology and Toxicology; College of Veterinary Medicine; Chungnam University; Daejon South Korea