1. Department of Cell and Tissue Biology, University of California, San Francisco, San Francisco, CA, USA.
2. Orthopedic Trauma Institute, University of California, San Francisco, San Francisco, CA, USA.
3. Department of Biomedical Engineering, University of Illinois, Chicago, Chicago, IL, USA.
4. Biointerfaces Institute, University of Michigan, Ann Arbor, MI, USA.
5. Department of Biologic and Materials Sciences, University of Michigan School of Dentistry, Ann Arbor, MI, USA.
6. Departments of Orthopedics, Pharmacology and Regenerative Medicine, and Mechanical and Industrial Engineering, University of Illinois, Chicago, Chicago, IL, USA.
7. Center for Regenerative Sports Medicine, Steadman Philippon Research Institute, Vail, CO, USA.