1. Equine Clinic of Grosbois; Boissy St Leger France
2. Hanseklinik für Pferde; Sittensen Germany
3. Department of Veterinary Clinical Sciences; Royal Veterinary College; North Mymms UK
4. Department of Otorhinolaryngology, Head & Neck Surgery, and Experimental Surgery Laboratory; UPRES EA 3830, GRHV, IRIB High Normandy, Rouen University Hospital; Rouen France
5. Université Paris-Est; Ecole Vétérinaire d'Alfort; Maisons-Alfort France
6. Department of Clinical Sciences; College of Veterinary Medicine; Cornell University; Ithaca New York USA