1. Department of Pathology, College of Veterinary Medicine, Cornell University, Ithaca, NY 14853, USA,
2. Department of Pathology, College of Veterinary Medicine, Cornell University, Ithaca, NY 14853, USA, and Hudson Highlands Veterinary Medical Group, PO Box 1320, Hopewell Junction, NY 12533, USA,
3. Hudson Highlands Veterinary Medical Group, PO Box 1320, Hopewell Junction, NY 12533, USA