1. Department of Neurology, Yonsei University College of Medicine, Seoul, Korea.
2. Department of Internal Medicine, Institute of Gastroenterology, Yonsei University College of Medicine, Seoul, Korea.
3. Department of Biotechnology, College of Biomedical & Health Science, Konkuk University, Chungju, Korea.
4. Research Institute for Biomedical & Health Science, Konkuk University, Chungju, Korea.