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. 2022 Aug 10;9:949938. doi: 10.3389/fsurg.2022.949938

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© 2022 Lin, Kim, Kotheeranurak, Chen, Hu and Rui.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Forest plots for comparison of ADH at preoperative (A) and final follow-up (B) between the static and expandable groups. Forest plots for comparison of PDH at preoperative (C) and final follow-up (D) between the static and expandable groups. ADH: anterior disc height; PDH: posterior disc height.