1. Department of Materials Science and Engineering Lehigh University Bethlehem Pennsylvania USA
2. Division of Cardiovascular Disease School of Medicine University of Alabama at Birmingham Birmingham Alabama USA
3. Department of Biomedical Engineering School of Engineering and School of Medicine University of Alabama at Birmingham Birmingham Alabama USA
4. Department of Bioengineering Lehigh University Bethlehem Pennsylvania USA
5. Department of Bioengineering, J. B. Speed School of Engineering University of Louisville Louisville Kentucky USA