Aging impairs fibrosis-4 index after sustained virologic response by direct-acting antivirals in chronic hepatitis C infection Tomoaki Nakajima; Yoshiyasu Karino; Shuhei Hige; Hirokazu Suii; Ryoji Tatsumi; Masakatsu Yamaguchi; Tomohiro Arakawa; Yasuaki Kuwata; Joji Toyota;

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