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Box-and-whisker plot of antibody titers after two doses of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) vaccine in untreated and treated lymphoma patients and age-matched controls. The treated groups are divided into 0–6 months, 7–12 months, 13–24 months, and 24 months and beyond according to the time since last treatment. Median values for each group are shown in squares
