1. Small Animal Teaching Hospital and Musculoskeletal Research Group; Faculty of Veterinary Science; University of Liverpool, Leahurst; Neston Cheshire CH64 7TE
2. 353a Boulevard Grignan 83000 Toulon France
3. Department of Rheumatology; University Hospital; Lille France
4. Unité de Chirurgie/Anesthésiologie; Département des Animaux de Compagnie; Ecole Nationale Vétérinaire de Lyon; 1 Avenue Bourgelat 69280 Marcy L'Etoile France
5. Centro Veterinario de Referencia Bahia de Malaga; Parque Empresarial Laurotorre 25, Alhaurin de la Torre 29130 Malaga Spain
6. Klinikum Veterinärmedizin, Klinik für Kleintiere, Chirurgie, Anästhesiologie, Schmerztherapie, Operative Intensivmedizin; Justus-Liebig Universität Giessen; Frankfurter Strasse 108 35392 Giessen Germany
7. Clinica Veterinaria Vezzoni; via Massarotti 60/A 26100 Cremona Italy