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Detection of HDV for patients with HBV-related diseases with ELISA, RT-PCR, and ddPCR. Flow diagram of the patient cohorts of HBV-related disease. ddPCR, digital droplet PCR; ELISA, enzyme-linked immunosorbent assay; HBV, hepatitis B virus; HDV, hepatitis delta virus; RT-PCR, reverse-transcriptase PCR.
