1. Department of Small Animal Clinical Sciences and; Michael E. DeBakey Institute for Comparative Cardiovascular Sciences and Biomedical Devices; College Station TX
2. Department of Veterinary Pathobiology; College Station TX
3. College of Veterinary Medicine and Biomedical Sciences; Texas A&M University; College Station TX
4. Department of Production Animal Studies; Faculty of Veterinary Science; University of Pretoria; Onderstepoort South Africa