1 Division of Gastroenterology, Department of Medicine, Kurume University School of Medicine, Kurume, Japan.
2 Division of Gastroenterology, Department of Medicine, Kurume University School of Medicine, Kurume, Japan; Multidisciplinary Treatment Cancer Center, Kurume University Hospital, Kurume, Japan. Electronic address: tanaka_toshimitsu@med.kurume-u.ac.jp.
3 Division of Gastroenterology, Department of Medicine, Kurume University School of Medicine, Kurume, Japan; Multidisciplinary Treatment Cancer Center, Kurume University Hospital, Kurume, Japan.
4 Multidisciplinary Treatment Cancer Center, Kurume University Hospital, Kurume, Japan.