1. Department of Veterinary Clinical Sciences, Louisiana State University, College of Veterinary Medicine, Skip Bertman Drive, Baton Rouge, LA 70803
2. William T. Pritchard Veterinary Medical Teaching Hospital, School of Veterinary Medicine, University of California Davis, One Shields Avenue, Davis, CA 95616
3. Department of Pathobiological Sciences, Louisiana State University, College of Veterinary Medicine, Skip Bertman Drive, Baton Rouge, LA 70803