1. Department of Clinical Sciences, Cummings School of Veterinary; Tufts University; North Grafton MA 01536
2. Dick White Referrals; Diagnostic Imaging; Cambridge CB8 0UH UK
3. Department of Veterinary Biosciences and Diagnostic Imaging; The University of Georgia; Athens GA 30602
4. Department of Quantitative Health Sciences; University of Massachusetts Medical School; Worcester MA 01655