1 Department of Neurology, Kagawa University Faculty of Medicine, Miki, Japan.
2 Department of Neurology, Kagawa University Faculty of Medicine, Miki, Japan; Department of General Internal Medicine, Kagawa University Faculty of Medicine, Miki, Japan. Electronic address: t-takata@med.kagawa-u.ac.jp.
3 Department of Intractable Neurological Research, Kagawa University, Faculty of Medicine, Miki, Japan.
4 Department of Gastroenterology, Kagawa University Faculty of Medicine, Miki, Japan.
5 Department of Health Sciences, Kagawa University Faculty of Medicine, Miki, Japan.