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. 2019 Jun 20;14:183. doi: 10.1186/s13018-019-1207-9

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© The Author(s). 2019

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided 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 Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 3 — Forest plot for retear rate. A fixed-effects model was used because of the acceptable heterogeneity (I2= 0%). The size of each square is proportional to the weight of the study. The dark diamond on the right of the vertical line, indicating that the retear rate was lower after PRP application than control groups. (CI, confidence interval; df, degrees of freedom; I2, heterogeneity test; M-H, Mantel-Haenszel; PRP, platelet-rich plasma; z, P value of weighted test for overall effect)