1 Department of Gastroenterology, Japanese Red Cross Wakayama Medical Center, Wakayama, Japan.
2 Department of Gastroenterology, Japanese Red Cross Wakayama Medical Center, Wakayama, Japan; Department of Gastroenterology and Hepatology, Kindai University Faculty of Medicine, Osaka, Japan. Electronic address: kousukeminaga@med.kindai.ac.jp.
3 Department of Gastroenterology and Hepatology, Kindai University Faculty of Medicine, Osaka, Japan.