[1] Kawasaki Med Sch, Dept Hlth Care Med, Kurashiki, Japan
[2] Kawasaki Med Sch, Dept Gen Internal Med 2, Kurashiki, Japan
[3] Junpukai Hlth Maintenance Ctr, Okayama, Japan
[4] Junpukai Long Life Hosp, Okayama, Japan
[5] Junpukai Hlth Maintenance Ctr Kurashiki, Kurashiki, Japan
[6] Kawasaki Med Sch, Dept Endoscopy & Ultrasound, Kurashiki, Japan
[7] Okayama Univ, Grad Sch Med Dent & Pharmaceut Sci, Dept Pract Gastrointestinal Endoscopy, Okayama, Japan
[8] Himeji Red Cross Hosp, Dept Internal Med, Himeji, Japan