1. Biomaterials and Tissue Engineering Division, Department of Endodontics, Prosthodontics and Operative Dentistry, University of Maryland Dental School, Baltimore, Maryland.
2. State Key Laboratory of Oral Diseases, West China School of Stomatology, Sichuan University, Chengdu, China.
3. Center for Stem Cell Biology and Regenerative Medicine, University of Maryland School of Medicine, Baltimore, Maryland.
4. University of Maryland Marlene and Stewart Greenebaum Cancer Center, University of Maryland School of Medicine, Baltimore, Maryland.
5. Department of Mechanical Engineering, University of Maryland, Baltimore County, Maryland.
6. University of Maryland Dental School, Baltimore, Maryland.
7. School of Denistry, University of North Carolina, Chapel Hill, North Carolina.