1. Department of Clinical Sciences, College of Veterinary Medicine, North Carolina State University, Raleigh, North Carolina, USA; Department of Family Medicine, School of Medicine, University of North Carolina, Chapel Hill, North Carolina, USA
2. Department of Clinical Sciences, College of Veterinary Medicine, North Carolina State University, Raleigh, North Carolina, USA
3. Educational Support Services, College of Veterinary Medicine, North Carolina State University, Raleigh, North Carolina, USA
4. Department of Medicine, University of North Carolina, Chapel Hill, North Carolina, USA