1. Department of Biochemistry, College of Medicine; Ewha Womans University; 1071 Anyangcheon-Ro, Yangcheon-Gu, Seoul 07985 Republic of Korea
2. Department of Health Sciences and Technology; Sungkyunkwan University; Seoul Republic of Korea
3. Stem Cell & Regenerative Medicine Institute, Samsung Medical Center; Seoul Republic of Korea
4. Department of Neurology, Samsung Medical Center; Sungkyunkwan University School of Medicine; Seoul Republic of Korea