[1] JA Shizuoka Kohseiren Enshu Hosp, Dept Internal Med, Naka Ku, 1-1-1 Chuo, Hamamatsu, Shizuoka 4300929, Japan
[2] Hamamatsu Univ, Sch Med, Med Educ Ctr, Higashi Ku, 1-20-1 Handayama, Hamamatsu, Shizuoka 4313192, Japan
[3] Hamamatsu Univ, Sch Med, Dept Internal Med, Higashi Ku, 1-20-1 Handayama, Hamamatsu, Shizuoka 4313192, Japan
[4] Maruyama Hosp, Dept Surg, Naka Ku, 39-10 Sukenobucho, Hamamatsu, Shizuoka 4300903, Japan