1. Division of Neurology; Department of Internal Medicine; Asahikawa Medical University; Asahikawa Hokkaido Japan
2. Department of Neurology; Yonezawa National Hospital; Yonezawa Yamagata Japan
3. Department of Neurology; Tohoku University School of Medicine; Sendai Miyagi Japan
4. Department of Neurology; Tohoku Medical and Pharmaceutical University School of Medicine; Sendai Miyagi Japan