1. Department of Biomedical Engineering, Texas A&M University, College of Engineering, College Station, Texas 77845, United States
2. Joint Department of Biomedical Engineering, North Carolina State University and University of North Carolina at Chapel Hill, College of Engineering, Raleigh, North Carolina 27695, United States
3. Comparative Medicine Institute, North Carolina State University, Raleigh, North Carolina 27695, United States
4. Department of Material Science and Engineering, Texas A&M University, College of Engineering, College Station, Texas 77845, United States