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. 2020 Oct 27;19:1533033820957033. doi: 10.1177/1533033820957033

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© The Author(s) 2020

This article is distributed under the terms of the Creative Commons Attribution-NonCommercial 4.0 License (https://creativecommons.org/licenses/by-nc/4.0/) which permits non-commercial use, reproduction and distribution of the work without further permission provided the original work is attributed as specified on the SAGE and Open Access pages (https://us.sagepub.com/en-us/nam/open-access-at-sage).

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Figure 1. — Biosensors sensitivity timeline from 2001 to date for selected biomarkers, as alfa-fetoprotein (AFP), Autocrine motility factor (AMF), carcinoembryonic antigen (CEA) and Prostate-specific antigen (PSA). Abbreviations used: CNT/Ag NT, silver-nanoparticle enriched carbon nanotube and HRP Horseradish peroxidase.