1. Department of Neurology, Pusan National University School of Medicine, Yangsan, Korea.
2. Department of Rheumatology, Pusan National University School of Medicine, Yangsan, Korea.
3. Medical Research Institute, Pusan National University School of Medicine, Yangsan, Korea.
4. Department of Orthopedic Surgery, Pusan National University School of Medicine, Yangsan, Korea.
5. Department of Pathology, Pusan National University School of Medicine, Yangsan, Korea.