1. Private practitioner; Arzano (Napoli) 80022 Italy
2. Department of Veterinary Clinical Medicine; University of Illinois at Urbana-Champaign; Urbana IL 61802 USA
3. Ambulatorio Veterinario Domitio; Castel Volturno (Caserta) 81030 Italy
4. Department of Small Animal Clinical Sciences; University of Florida; Gainesville FL 32608 USA