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Lead-time prejudice, often causing an overestimation of assessment effectiveness, is an elementary and fundamental problem in cancer evaluating. Quantification and modification of lead-time bias are crucial when evaluating the effectiveness of endoscopic testing when you look at the risky location in China.Lead-time prejudice, often causing an overestimation of testing effectiveness, is a primary and fundamental issue in disease assessment. Quantification and correction of lead-time bias a