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. 2018 Nov 20;18:873. doi: 10.1186/s12913-018-3585-9

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© The Author(s). 2018

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. 4 — Comparison of the features of donor sperm cycles and donor egg cycles. a–f, The age at treatment for infertility, number of cycles, clinical pregnancy rates, miscarriage rates, ectopic pregnancy rates, and multiple pregnancy rates are shown for donor sperm cycles and donor egg cycles in Liaoning province from 2012 to 2016. * p < 0.05