1. Department of Mechanical Science and Engineering, University of Illinois, Urbana, IL 61801
2. Department of Mechanical Engineering, Stevens Institute of Technology, Hoboken, NJ 07030
3. Department of Mechanical Engineering, Stevens Institute of Technology, Hoboken, NJ 07030; Translational and Molecular Imaging Institute, Icahn School of Medicine at Mount Sinai, New York, NY 10029
4. Department of Aerospace Engineering, University of Illinois, Urbana, IL 61801