Department of Gastroenterology, National Hospital Organization Hakodate National Hospital, Hakodate, Hokkaido, Japan; Correspondence: Address correspondence to: Kimitoshi Kubo, MD, Department of Gastroenterology, National Hospital Organization Hakodate National Hospital, 18-16 Kawahara-cho, Hakodate, Hokkaido 041-8512, Japan.
Noriko Kimura
Department of Pathology, National Hospital Organization Hakodate National Hospital, Hakodate, Hokkaido, Japan
