1. Joint Department of Biomedical Engineering at University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, and North Carolina State University, Raleigh, North Carolina.
2. National Institute of Environmental Health Sciences, NIH, Research Triangle Park, North Carolina.
3. Department of Orthopedics, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina.
4. Department of Materials Science and Engineering, North Carolina State University, Raleigh, North Carolina.