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Pooled odds ratios for serological markers and esophageal squamous cell carcinoma adjusted for study matching variables only (left) and fully adjusted (right). Circles represent odds ratios, horizontal lines represent 95% confidence intervals, and the vertical lines represent the odds ratios of unity for the seronegative referent groups. HPV = human papillomavirus; JCV = JC virus; MCV = Merkel cell virus; OR = odds ratio; CI = confidence interval.
