1. Department of Veterinary Medicine; Surgical Discovery Centre; University of Cambridge; Madingley Road Cambridge CB3 0ES United Kingdom
2. Michigan State University; East Lansing 48824 Michigan
3. Colorado State University; Fort Collins 80523 Colorado
4. Wright State University; Dayton 45435 Ohio
5. Veterans Affairs Medical Center; Cincinnati 45220 Ohio
6. University of Zurich; Zurich Switzerland