1. Department of Veterinary Population Medicine; College of Veterinary Medicine; University of Minnesota; St Paul USA
2. Ontario Veterinary College; University of Guelph; Guelph Ontario Canada
3. Rood and Riddle Equine Hospital; Lexington Kentucky USA
4. Institute of Veterinary, Animal and Biomedical Sciences; Massey University; Palmerston North New Zealand
5. College of Veterinary Medicine; University of Florida; Gainesville USA