1 Department of General Internal Medicine, Kagawa University Faculty of Medicine, 1750-1 Ikenobe, Miki-Cho, Kita-Gun, Kagawa, 761-0793, Japan. t-takata@med.kagawa-u.ac.jp.
2 Department of Supportive and Promotive Medicine of the Municipal Hospital, Kagawa University Faculty of Medicine, 1750-1 Ikenobe, Miki-Cho, Kita-Gun, Kagawa, 761-0793, Japan.
3 Department of Gastroenterology, Kagawa University Faculty of Medicine, 1750-1 Ikenobe, Miki-Cho, Kita-Gun, Kagawa, 761-0793, Japan.
4 Department of Neurology, Kagawa University Faculty of Medicine, 1750-1 Ikenobe, Miki-Cho, Kita-Gun, Kagawa, 761-0793, Japan.