1. Department of Veterinary Sciences; University of Pisa; Pisa Italy
2. Istituto Veterinario di Novara; Novara Italy
3. Veterinary Hospital Città di Pavia; Pavia Italy
4. Clinic for Small Animal Internal Medicine, Vetsuisse Faculty; University of Zurich; Zurich Switzerland
5. Department of Animal Medicine, Production and Health; University of Padova; Padova Italy
6. Veterinary Teaching Hospital, Department of Animal Medicine and Surgery; Murcia Spain