1. Department of General Internal Medicine, Hiroshima University Hospital , 1-2-3, Kasumi, Minami-ku, Hiroshima 734-8551, Japan ; email: morimiya@hiroshima-u.ac.jp
2. Department of General Internal Medicine, Hiroshima University Hospital , 1-2-3, Kasumi, Minami-ku, Hiroshima 734-8551, Japan