1. School of Computer Science and Engineering, Soongsil University, Dongjak-Gu, Seoul, Korea
2. Department of Radiology, Asan Medical Center, University of Ulsan College of Medicine, Songpa-ku, Seoul, Korea
3. Department of Systems Management Engineering, Sungkyunkwan University, Seobu-ro, Jangan-gu, Suwon-si, Gyeong gi-do, Korea