1. Department of Veterinary Preventive Medicine; College of Veterinary Medicine; The Ohio State University; Columbus OH
2. Rood and Riddle Equine Hospital; Lexington KY
3. United Sates Department of Agriculture; Agricultural Research Service; Beltsville Agricultural Research Center; Animal Parasitic Diseases Laboratory; Beltsville MD
4. American Veterinary Medical Association; Schaumburg IL
5. Colorado School of Public Health; James L. Voss Veterinary Teaching Hospital; Colorado State University; Fort Collins CO
6. Faculty of Veterinary and Agricultural Sciences; University of Melbourne; Parkville Vic Australia
7. Department of Veterinary Clinical Sciences; College of Veterinary Medicine; The Ohio State University; Columbus OH