1. Department of Dermatology, University of Alabama at Birmingham, Birmingham, AL, USA
2. Department of Oral Biology, Center for Craniofacial Regeneration, University of Pittsburgh School of Dental Medicine, Pittsburgh, PA, USA
3. Department of Surgery, University of Alabama at Birmingham, Birmingham, AL, USA
4. Department of Structural Biology, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA
5. McGowan Institute for Regenerative Medicine, University of Pittsburgh, Pittsburgh, PA, USA