Figure 1From: A meta-analysis and systematic review: adjuvant interferon therapy for patients with viral hepatitis-related hepatocellular carcinomaProcess of study selection. The excluded 11 articles include eight articles without controlled trials, one article’s patients follow-up less than one year ,one article’s sample size <=20 cases and two articles from a single author appeared to include duplication of patients, only the study with the largest patient group was included and the other one was excluded.Back to article page