1. Department of Internal Medicine, Soonchunhyang University College of Medicine, Cheonan, Korea.
2. Department of Pathology, Soonchunhyang University College of Medicine, Cheonan, Korea.
3. Department of Neurology, Soonchunhyang University College of Medicine, Cheonan, Korea.
4. Department of Neurosurgery, Soonchunhyang University College of Medicine, Cheonan, Korea.