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. 2020 Dec 8;13:1756284820977402. doi: 10.1177/1756284820977402

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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. — PRISMA flow diagram showing study selection process.

ACR, American College of Rheumatology; FGID, functional gastrointestinal disorders; PRISMA, preferred reporting items for systematic reviews and meta-analyses.