1. Department of Clinical Studies - Philadelphia, School of Veterinary Medicine; University of Pennsylvania; 3900 Delancey Street Philadelphia PA 19104 USA
2. Department of Environmental Health Sciences; Johns Hopkins Bloomberg School of Public Health; 615 N. Wolfe Street Baltimore MD 21205 USA
3. Lehigh Valley Veterinary Dermatology; 4580 Crackersport Road Allentown PA 18104 USA
4. Department of Pathobiology, School of Veterinary Medicine; University of Pennsylvania; 3900 Delancey Street Philadelphia PA 19104 USA