1. Research Institute, Humetacell Inc., Bucheon-si 14786, Republic of Korea
2. Department of Neurosurgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul 05505, Republic of Korea
3. School of Life Sciences & Biotechnology, College of Natural Sciences, Kyungpook National University, Daegu 41566, Republic of Korea
4. School of Life Sciences, BK21 FOUR KNU Creative BioResearch Group, Kyungpook National University, Daegu 41566, Republic of Korea
5. College of Medicine and Medical Research Institute, Chungbuk National University, Cheongju-si 28644, Republic of Korea