- Received November 30, 2010.
- Accepted January 28, 2011.
- Published online July 25, 2011.
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- 1Bioengineering Program, Georgia Institute of Technology, Atlanta, GA 30332–0250, USA
- 2School of Physics, Georgia Institute of Technology, Atlanta, GA 30332–0250, USA
- 3Department of Mechanical Engineering, Northwestern University, Evanston, IL 60208, USA
- ↵*Author for correspondence ( ).