Yuko Sakakibara1, Shoichi Nakazuru1, Yoshinori Kodama2, Eiji Mita1. 1. Department of Gastroenterology and Hepatology (Yuko Sakakibara, Shoichi Nakazuru, Eiji Mita), Japan. 2. Department of Pathology (Yoshinori Kodama), National Hospital Organization, Osaka National Hospital, Osaka, Japan.