1. Center for Craniofacial Regeneration, University of Pittsburgh, Pittsburgh, PA 15260, USA
2. Department of Bioengineering, University of Pittsburgh, Pittsburgh, PA 15260, USA
3. McGowan Institute for Regenerative Medicine, University of Pittsburgh, Pittsburgh, PA 15260, USA
4. Restorative Dentistry/Comprehensive Care, University of Pittsburgh, Pittsburgh, PA 15260, USA
5. Departments of Chemical and Petroleum Engineering and Mechanical Engineering and Materials Science, University of Pittsburgh, Pittsburgh, PA 15260, USA
6. Department of Oral Biology, University of Pittsburgh, Pittsburgh, PA 15260, USA