Effect of interferon therapy on the risk of hepatocellular carcinoma and mortality in patients with chronic hepatitis C: a large retrospective cohort study of 3296 patients: Yasuharu Imai, Ikeda Municipal Hospital, Ikeda Japan; Akinori Kasahara, Osaka University Hospital, Suita Japan; Takeshi Okanoue, Kyoto Prefectural University of Medicine, Kyoto Japan; Hirohito Tsubouchi, Miyazaki Medical College, Miyazaki Japan; Sumio Kawata, Yamagata University School of Medicine, Yamagata Japan; Shinji Tamura, Osaka University Graduate School of Medicine, Suita Japan; Kentaro Yoshioka, Nagoya University School of Medicine, Nagoya Japan; Kendo Kiyosawa, Shinshu University School of Medicine, Matsumoto Japan; Shinichi Kakumu, Aichi Univ Sch of Medicine, Aichi Japan; Kiwamu Okita, Yamaguchi University School of Medicine, Ube Japan; Norio Hayashi, Osaka University Graduate School of Medicine, Suita Japan