Second Department of Medicine;
Asahikawa Medical College;
Asahikawa;
Japan;
Department of Surgical Pathology;
Asahikawa Medical College;
Asahikawa;
Japan;
Health Care Administration Center;
Obihiro University of Agriculture and Veterinary Medicine;
Obihiro;
Japan;
Department of Gastroenterology;
Dokkyo University School of Medicine;
Mibu;
Japan;