1. McGowan Institute for Regenerative Medicine, University of Pittsburgh, Pittsburgh, PA 15219, USA.
2. Department of Surgery, University of Pittsburgh, Pittsburgh, PA 15219, USA.
3. Department of Plastic Surgery, University of Pittsburgh, Pittsburgh, PA 15219, USA.
4. Department of Bioengineering, University of Pittsburgh, Pittsburgh, PA 15219, USA.
5. Department of Physical Medicine & Rehabilitation, University of Pittsburgh, Pittsburgh, PA 15219, USA.
6. Department of Radiology, University of Pittsburgh, Pittsburgh, PA 15219, USA.