1. Department of Engineering Science and Mechanics, Pennsylvania State University, University Park, PA, USA
2. Department of Molecular, Cellular and Developmental Biology, Yale University, New Haven, CT, USA
3. Quantitative Biology Institute, Yale University, New Haven, CT, USA
4. Department of Biomedical Engineering, Pennsylvania State University, University Park, PA, USA
5. Department of Material Science and Engineering, Pennsylvania State University, University Park, PA, USA