1. McGowan Institute for Regenerative Medicine, Pittsburgh, Pennsylvania.
2. Department of Bioengineering, University of Pittsburgh, Pittsburgh, Pennsylvania.
3. Department of Pathology, University of Pittsburgh, Pittsburgh, Pennsylvania.
4. School of Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania.
5. Hospital Universitario, Fundación Favaloro, Buenos Aires, Argentina.
6. Department of Surgery, University of Pittsburgh, Pittsburgh, Pennsylvania.