1. Department of Medicine & Epidemiology; School of Veterinary Medicine, University of California, Davis; Davis California
2. Vetsuisse Faculty, Clinic for Small Animal Internal Medicine, Vetsuisse Faculty; University of Zurich; Zurich Switzerland
3. Department of Molecular Biomedical Sciences; North Carolina State University, College of Veterinary Medicine; Raleigh North Carolina
4. Department of Small Animal Clinical Sciences; College of Veterinary Medicine, Texas A & M University; College Station Texas