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. 2020 Oct 27;25(1):27–37. doi: 10.1097/LGT.0000000000000573

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Copyright © 2020 The Author(s). Published by Wolters Kluwer Health, Inc. on behalf of the ASCCP.

This is an open-access article distributed under the terms of the Creative Commons Attribution-Non Commercial-No Derivatives License 4.0 (CCBY-NC-ND), where it is permissible to download and share the work provided it is properly cited. The work cannot be changed in any way or used commercially without permission from the journal.

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The PRISMA flow diagram detailing the process of search and selection. Article search and selection occurred over 4 stages (identification, screening, eligibility, and included). Selection began with 830 abstracts, and after exclusion of duplicates (n = 58), removal based on exclusion criteria (n = 686), removal based on outcomes missing (n = 21), missing pre/post data (n = 18), missing genotyping (n = 14), testing interval too large (n = 2), and not original research (n = 1) resulted in 10 articles included for this systematic review.