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. 2020 Jul 8;15:1177271920940712. doi: 10.1177/1177271920940712

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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. — Comparison of serum IL-31 levels between CPUO and healthy subjects. Serum IL-31 levels were significantly higher in CPUO patients than in healthy subjects. CPUO indicates chronic pruritus of unknown origin; IL-31, interleukin-31.