1 Department of General Internal Medicine, Matsunami General Hospital, Dendai 185-1, Kasamatsu-cho, Hashima-gun, Gifu 501-6062, Japan.
2 Department of General Internal Medicine, Matsunami General Hospital, Dendai 185-1, Kasamatsu-cho, Hashima-gun, Gifu 501-6062, Japan. Electronic address: kunieda_t@yahoo.co.jp.