1. ‘San Marco’ Veterinary Laboratory, Via Sorio 114/C–35141 Padua, Italy
2. ‘San Marco’ Veterinary Clinic, Via Sorio 114/C–35141 Padua, Italy
3. Department of Veterinary Clinical Sciences, Faculty of Veterinary Medicine, University of Padua, Agripolis, Viale dell'Università 16–35020 Legnaro (PD), Italy