1. Noyes-Giannestras Biomechanics Laboratories, Department of Aerospace Engineering and Engineering Mechanics, University of Cincinnati, Cincinnati, Ohio.
2. Department of Laboratory Medicine, Division of Comparative Pathology, University of Cincinnati, Cincinnati, Ohio.
3. Institute of Bioengineering and Bioscience, Georgia Institute of Technology, Atlanta, Georgia.
4. Genzyme Tissue Repair, Inc., Boston, Massachusetts.
5. Skeletal Research Center/Department of Biology, Case Western Reserve University, Cleveland, Ohio.