1. School of Electrical Engineering; Korea Advanced Institute of Science and Technology; 291 Daehak-ro, Yuseong-gu Daejeon 34141 Korea
2. Department of Software Convergence; College of Interdisciplinary Studies for Emerging Industries; Seoul Women's University; 621 Hwarang-ro Nowon-gu, Seoul 01797 Korea
3. Department of Radiology; Severance Hospital; Research Institute of Radiological Science; Yonsei University College of Medicine; 50-1 Yonsei-ro, Seodaemun-gu Seoul 03722 Korea