1. Department of Pathobiology, Anatomic Pathology; University of Pennsylvania; School of Veterinary Medicine; 3900 Delancey Street; MJR VHUP 4037; Philadelphia; PA; 19104-6051; USA
2. Department of Pathology, Microbiology and Immunology; University of California, Davis; School of Veterinary Medicine; One Shields Avenue; 4206 VM3A; Davis; CA; 95616; USA