Influence of interleukin-10 gene promoter polymorphisms on disease progression in patients with chronic hepatitis B virus infection: Seiji Miyazoe, Keisuke Hamasaki, Keisuke Nakata, Yuji Kajiya, Kazuaki Ohkubo, Hiroki Ishikawa, Nagasaki University School of Medicine, Nagasaki Japan; Kazuhiko Nakao, Health Research Center, Nagasaki University, Nagasaki Japan; Manabu Daikoku, National Nagasaki Medical Center, Ohomura Japan; Hiroshi Yatsuhashi, Michiaki Koga, Michitami Yano, National Nagasaki Medical Center, Ohmura Japan; Katsumi Eguchi, Nagasaki University School of Medicine, Nagasaki Japan