1 Department of Gastroenterology and Hepatology, Fukuchiyama City Hospital, Fukuchiyama-City (Kohei Oka, Takashi Okuda).
2 Department of Gastroenterology and Hepatology, Japanese Red Cross Kyoto Daiichi Hospital (Yutaka Inada).
3 Department of Molecular Gastroenterology and Hepatology, Graduate School of Medical Science, Kyoto Prefectural University of Medicine (Naohisa Yoshida), Kyoto, Japan.