1. Medical Device Research Center, Research Institute for Future Medicine; Samsung Medical Center; Seoul 06351 Republic of Korea
2. Department of Chemical Engineering, Imperial College London; South Kensington Campus; London SW7 2AZ UK
3. Center for Bionics; Korea Institute of Science and Technology (KIST); Seoul 02792 Republic of Korea
4. Translational and Stem Cell Research Laboratory on Stroke; Samsung Medical Center; Seoul 06351 Republic of Korea
5. Department of Neurology, Samsung Medical Center; Sungkyunkwan University School of Medicine; Seoul 06351 Republic of Korea
6. KU Convergence Science and Technology Institute, Department of Stem Cell and Regenerative Biotechnology; Konkuk University; Hwayang-dong, Kwangjin-gu Seoul 05029 Republic of Korea