1. Department of Population Health and ReproductionSchool of Veterinary Medicine, University of California Davis California
2. Department of Large Animal Clinical SciencesCollege of Veterinary Medicine, Michigan State University East Lansing Michigan
3. McPhail Equine Neuromuscular Diagnostic and Research Laboratory, McPhail Equine Performance CenterCollege of Veterinary Medicine, Michigan State University East Lansing Michigan
4. Service Department, Veterinary Genetics Lab (Penedo)University of California Davis California