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. 2018 Sep 14;21(4):826–836. doi: 10.1038/s41436-018-0262-7

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© The Author(s) 2018

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 2 — Subgroup analysis of CFTR variants and 5T allele frequency in patients with congenital unilateral absence of the vas deferens (CUAVD). Solid squares indicate the pooled effect size of each study, with horizontal lines representing the 95% confidence interval (CI). a Frequency of at least one CFTR variant. b Frequency of two CFTR variants. c Frequency of one CFTR variant. d Frequency of 5T allele. CF cystic fibrosis, RA renal abnormalities.