Department of Neurosurgery, Bundang CHA Medical Center, CHA University, Yatap-dong 59, Seongnam, Republic of Korea. Institute Department of Biomedical Science, College of Life Science, CHA University, Seongnam-si, Gyeonggi-do, Republic of Korea. Soonchunhyang Institute of Medi-bio Science (SIMS), Soonchunhyang University, Cheonan-si, Chungcheongnam-do, Republic of Korea. Department of Neurosurgery, Bundang CHA Medical Center, CHA University, Yatap-dong 59, Seongnam, Republic of Korea. sandori50@gmail.com. Institute Department of Biomedical Science, College of Life Science, CHA University, Seongnam-si, Gyeonggi-do, Republic of Korea. kbkwack@cha.ac.kr.