1. Department of Mechanical Engineering; Korea Advanced Institute of Science and Technology(KAIST); 291 Daehak-ro Yuseong-gu Daejeon 34141 Republic of Korea
2. Department of Neurosurgery; University of Texas Health Science Center at Houston; 6431 Fannin Street Houston TX 77030 USA
3. Department of Otorhinolaryngology; Seoul National University Bundang Hospital; 82, Gumi-ro, Bundang-gu Seongnam Republic of Korea