1. Department of Oral Medicine, Pathology, and Oncology, University of Michigan School of Dentistry, Ann Arbor, MI 48109-1078
2. Craniofacial and Skeletal Diseases Branch, National Institute of Dental and Craniofacial Research, National Institutes of Health, Bethesda, MD
3. Dipartimento di Medicina Sperimentale, Universita dell Aquila, L'Aquila, Italy