1. Parker H. Petit Institute for Bioengineering and Bioscience and Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, Georgia;
2. Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, Atlanta, Georgia;
3. Department of Bio-inspired Science, Ewha Womans University, Seoul, South Korea; and
4. Division of Cardiology, Department of Medicine, Emory University, Atlanta, Georgia