1. Department of Clinical Studies, School of Veterinary Medicine, Aristotle University of Thessaloniki, 11 St. Voutyra Street, 546 27, Thessaloniki, Greece, Tel: +30 310 994502, Fax: +30 310 9994471, e-mail:kadamama@vet.auth.gr
2. Clinic of Surgery, Faculty of Veterinary Medicine, University of Thessaly, PO box: 199, 43100 Karditsa, Greece