1. Department of Veterinary Pathobiology, College of Veterinary Medicine, University of Missouri, Columbia, Missouri, USA
2. Department of Otolaryngology–Head and Neck Surgery, School of Medicine, University of Missouri, Columbia, Missouri, USA
3. Department of Biomedical Sciences, College of Veterinary Medicine, University of Missouri, Columbia, Missouri, USA
4. Department of Statistics, College of Arts and Sciences, University of Missouri, Columbia, Missouri, USA