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Observational Studies of Gastric Cancer Screening by Upper Gastrointestinal Series
CI, confidence interval.
a)Excluded cases within 6 months before the date of diagnosis; b)Excluded cases within 1 month before the date of diagnosis among subjects who underwent at least one screening test; c)Excluded cases within 6 months before the date of diagnosis among subjects who underwent at least one screening test; d)Adjusted for age or age and sex.
