1. Department of Electrical and Computer Engineering, Seoul National University, Seoul 08826, Republic of Korea
2. Department of Mechanical Engineering, Stanford University, Stanford, California 94305, United States
3. Department of Radiation Oncology, Stanford University, Stanford, California 94305, United States
4. Department of Radiology, Stanford University, Stanford, California 94305, United States
5. Department of Electrical Engineering, Stanford University, Stanford, California 94305, United States
6. Nano System Institute, Seoul National University, Seoul 08826, Republic of Korea
7. Inter-university Semiconductor Research Center, Seoul National University, Seoul 08826, Republic of Korea