1 Department of General Medicine, Okayama University Graduate School of Medicine, Dentistry, and Pharmaceutical Sciences Japan; Department of General Medicine, Fujii Hospital, Fukuyama, Hiroshima, Japan. Electronic address: me422084@s.okayama-u.ac.jp.
2 Department of General Medicine, Fujii Hospital, Fukuyama, Hiroshima, Japan.
3 Department of General Medicine, Okayama University Graduate School of Medicine, Dentistry, and Pharmaceutical Sciences Japan.