1. Clinica Veterinaria “Gran Sasso”; Milan Italy
2. Department of Veterinary Sciences; University of Parma; Parma Italy
3. Davies Veterinary Specialists Limited; Herts UK
4. Department of Statistics and Quantitative Methods; Section of Biostatistics, Epidemiology and Public Health; University of Milano-Bicocca; Milan Italy
5. Department of Veterinary Science and Human Health; University of Milan; Milan Italy