1. Veteran's Affairs Medical Center, Pittsburgh, Pennsylvania.
2. Department of Pathology, University of Pittsburgh, Pittsburgh, Pennsylvania.
3. Department of Stomatology, Chinese PLA General Hospital, Beijing, China.
4. Department of Orthopaedic Surgery, Center for Cellular and Molecular Engineering, University of Pittsburgh, Pittsburgh, Pennsylvania.
5. Department of Pathology, West Virginia University School of Medicine, Morgantown, West Virginia.
6. Department of Microbiology, Immunology & Cell Biology, West Virginia University School of Medicine, Morgantown, West Virginia.
7. Department of Cell Biology, Washington University, Saint Louis, Missouri.
8. Department of Neurobiology, Pharmacology & Physiology, University of Chicago, Chicago, Illinois.