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. 2019 Jul 1;20:387. doi: 10.1186/s13063-019-3504-3

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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. 1 — Flow chart of the patients who participated in the clinical trial. Pain and functional scores were evaluated and magnetic resonance imaging (MRI) was performed preoperatively and after one year follow up. BM-MSCs, bone marrow mesenchymal stem cells