1. Texas A&M University, Department of Electrical and Computer Engineering, College Station, Texas 77843, United States
2. University of Pittsburgh, Department of Bioengineering, Pittsburgh, Pennsylvania 15260, United States
3. Pohang University of Science and Technology, Department of Creative IT Engineering, Pohang 790-784, Republic of Korea
4. Washington University in St. Louis, Department of Biomedical Engineering, St. Louis, Missouri 63130, United States