1. IMEC, Leuven, Belgium
2. Department of Electrical Engineering (ESAT) of KU Leuven, Leuven, Belgium
3. Department of Semiconductor Science, Dongguk University, Seoul, Republic of Korea
4. Department of Semiconductor Systems Engineering, Sungkyunkwan University, Suwon, Republic of Korea
5. Department of Electrical and Computer Engineering, Sungkyunkwan University, Suwon, Republic of Korea
6. Department of Photonics and Nanoelectronics, BK21 FOUR ERICA-ACE Center, Hanyang University ERICA, Ansan, Gyeonggi-do, Republic of Korea