1. Department of Materials Science and Engineering, College Station, Texas 77840, USA
2. Department of Biomedical Engineering, College Station, Texas 77840, USA
3. Texas A&M Engineering Experiment Station Center for Remote Health Technologies and Systems, College Station, Texas 77840, USA
4. Department of Electrical and Computer Engineering, College Station, Texas 77840, USA
5. Physics Laboratory, School of Medicine, Jikei University, 8-3-1 Kokuryo Cho, Chofu, Tokyo, Japan
6. Center for Frontier Medical Engineering, Chiba University, Inage Ku, Chiba, Japan