1. Department of Biomedical Engineering, University of Michigan, 1101 Beal Avenue, Ann Arbor,
Michigan 48109, United States
2. Center for Wireless Integrated
Microsensing and Systems, University of Michigan, 1301 Beal Avenue, Ann Arbor, Michigan 48109, United States
3. Department of Mechanical Engineering, University of Michigan, 2350 Hayward, Ann Arbor, Michigan,
48109, United States
4. Department
of Mechanical and
System Design Engineering, Hongik University, 94 Wausan-ro, Mapo-gu, Seoul, 121-791, South Korea