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. 2020 Sep 2;5(5):e000889. doi: 10.1136/esmoopen-2020-000889

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© Author (s) (or their employer(s)) 2020. Re-use permitted under CC BY-NC. No commercial re-use. Published by BMJ on behalf of the European Society for Medical Oncology.

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Cut-off index (COI) of seronegative and healthy individuals (left) and of seropositive individuals (right). The red circle indicates the COI of the false positive patient.