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Study flowchart. The study was composed of two prospective observational cohorts. In the systematic cohort (left panel), all patients from two dialysis centres received a third dose of BNT162b2 regardless of the anti-S IgG titre measured after the second dose. In the conditional cohort (right panel), the third dose of BNT162b2 was given to patients who did not develop or developed a low anti-S IgG titre after the second dose.
