1. Department of Mechanical Engineering University of Michigan Ann Arbor MI 48109 USA
2. Department of Mechanical and Industrial Engineering University of Massachusetts Amherst MA 01003 USA
3. Department of Applied Physics University of Science and Technology of China Anhui Hefei 230026 P. R. China
4. Department of Biomedical Engineering Rensselaer Polytechnic Institute Troy NY 12180 USA
5. Center for Biotechnology and Interdisciplinary Studies Rensselaer Polytechnic Institute Troy NY 12180 USA
6. Department of Biomedical Engineering University of Michigan Ann Arbor MI 48109 USA
7. Department of Cell and Developmental Biology University of Michigan Ann Arbor MI 48109 USA