1. Hagey Laboratory for Pediatric Regenerative Medicine, Plastic and Reconstructive Surgery Division, Department of Surgery, Stanford University School of Medicine, Stanford, California, USA
2. School of Medicine, University of California, San Francisco, San Francisco, California, USA
3. Department of Radiology, Stanford University, Stanford, California, USA
4. Department of Surgery, Duke University, Durham, North Carolina, USA
5. School of Dentistry, University of California, Los Angeles, Los Angeles, California, USA
6. Institute for Stem Cell Biology and Regenerative Medicine, Stanford University, Stanford, California, USA