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Objective To compare the effect of An’s Shaobei Injection (安氏芍倍注射液) with Xiaozhiling Injection (消痔灵注射液) in patients with internal hemorrhoids of grade I–III. Methods This cohort study included 1,520 internal hemorrhoids patients with grade I–III who were scheduled for liquid injection treatment from July 2003 to July 2009. The cohort included patients who underwent either An’s Shaobei Injection...