1. Department of Neurology, Seoul Hospital, Ewha Womans University College of Medicine, Seoul, Korea.
2. Department of Neurology, Kyung Hee University College of Medicine, Seoul, Korea.
3. Clinical Trial Center, Mokdong Hospital, Ewha Womans University College of Medicine, Seoul, Korea.
4. Department of Nephrology, Seoul Hospital, Ewha Womans University College of Medicine, Seoul, Korea.