1. Department of Stomatology, Tenth People's Hospital of Tongji University, Shanghai, China.
2. Institute for Tissue Engineering and Regenerative Medicine, The Chinese University of Hong Kong, Hong Kong, China.
3. School of Biomedical Sciences, Faculty of Medicine, The Chinese University of Hong Kong, Hong Kong, China.
4. Department of Plastic Surgery, University of Pittsburgh, Pittsburgh, Pennsylvania.
5. McGowan Institute for Regenerative Medicine, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania.
6. Department of Oral Biology, University of Pittsburgh, Pittsburgh, Pennsylvania.
7. Department of Bioengineering, University of Pittsburgh, Pittsburgh, Pennsylvania.