1. Department of Biomedical Engineering, University of Michigan, Ann Arbor, Michigan.
2. Department of Molecular & Integrative Physiology, University of Michigan, Ann Arbor, Michigan.
3. Department of Mechanical Engineering, University of Michigan, Ann Arbor, Michigan.
4. Department of Macromolecular Science and Engineering, University of Michigan, Ann Arbor, Michigan.
5. Department of Orthopedic Surgery, University of Michigan, Ann Arbor, Michigan.