1 Department of Biomedical Engineering, Duke University, Durham, NC, USA.
2 Department of Electrical Engineering, Convergence IT Engineering, Mechanical Engineering, and Medical Science and Engineering, Pohang University of Science and Technology, Pohang, Republic of Korea.
3 Department of Physics, Toronto Metropolitan University, Toronto, Ontario, Canada.
4 Department of Biomedical Engineering, Washington University in Saint Louis, Saint Louis, MO, USA.