1. Health Sciences and Technology (HST) Institute for Medical Engineering and Science (IMES) Massachusetts Institute of Technology and Harvard University 77 Massachusetts Avenue 76‐679 Cambridge MA 02139 USA
2. Department of Mechanical and Aerospace Engineering University of Central Florida P.O. Box, 162450, ENGR 1, Rm. 213 Orlando FL 32816 USA
3. Department of Materials Science and Engineering Advanced Materials Processing and Analysis Center, (AMPAC) Nanoscience Technology Center (NSTC) University of Central Florida P.O. Box 162455, ENGR 1, Rm. 207 Orlando FL 32816 USA
4. Department of Mechanical Engineering and Applied Mechanics University of Pennsylvania 229, Towne Building, 220 South 33rd Street Philadelphia PA 19104 USA