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Abbreviations: PSA, prostate specific antigen; CI, confidence interval; tPSA ELISA, total serum PSA concentration determined by IgY-based ELISA; tPSA IBL, total serum PSA concentration determined with the PSA total ELISA (IBL International, Hamburg, Germany); tPSA Cobas, total serum PSA concentration determined with the Cobas 6000 (Roche Diagnostics, Warszawa, Poland).
