1. Equine Sports Medicine Centre; Faculty of Veterinary Medicine; University of Liege; B-4000 Liege Belgium
2. Frank Duncombe Laboratory; 14053 Caen CEDEX 4 France
3. CIRALE; UMR-INRA 957, Ecole Nationale Vétérinaire d'Alfort; 14430 Goustranville France