{"paper_id":"0cb53c84-a563-4e47-b29b-94069fbab530","body_text":"Niu et al. BMC Anesthesiology          (2021) 21:314  \nhttps://doi.org/10.1186/s12871-021-01540-1\nRETRACTION NOTE\nRetraction Note: Oxycodone \nversus morphine for analgesia after laparoscopic \nendometriosis resection\nLijun Niu1, Lihong Chen2, Yanhua Luo3, Wenkao Huang4 and Yunsheng Li1* \n© The Author(s) 2021. Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which \npermits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the \noriginal author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or \nother third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line \nto the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory \nregulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this \nlicence, visit http://creativecommons.org/licenses/by/4.0/. The Creative Commons Public Domain Dedication waiver (http://creativecom-\nmons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated in a credit line to the data.\nRetraction Note: BMC Anesthesiol 21, 194 (2021)\nhttps://doi.org/10.1186/s12871-021-01417-3\nThe Editor has retracted this article because after \nobtaining approval for this clinical trial from the Insti -\ntutional Ethical Review Committee for Clinical Trials of \nThe First Affiliated Hospital of Sun Yat-sen University the \nauthors made changes to the protocol without obtain -\ning the Committee’s approval. All authors agree to this \nretraction.\nAuthor details\n1 Department of Anesthesiology, The First Affiliated Hospital, Sun Yat-sen \nUniversity, No.58, Zhongshan 2nd Road, Guangzhou 510080, China. 2 Depart-\nment of Anesthesiology, The Six Affiliated Hospital, Sun Yat-sen University, No. \n26, Erheng Road, Guangzhou 510655, China. 3 Department of Anesthesiology, \nZhongshan Ophthalmic Center, Sun Yat-Sen University, No.54 Xianlie South \nRoad, Guangzhou 510060, China. 4 Department of Anesthesiology, Nanfang \nHospital, Southern Medical University, 1838 Guangzhou Avenue North, \nGuangzhou, China. \nPublisher’s Note\nSpringer Nature remains neutral with regard to jurisdictional claims in pub-\nlished maps and institutional affiliations.\nOpen Access\nThe original article can be found online at https:// doi. org/ 10. 1186/ s12871- \n021- 01540-1.\n*Correspondence:  liysheng@mail.sysu.edu.cn\n1 Department of Anesthesiology, The First Affiliated Hospital, Sun Yat-sen \nUniversity, No.58, Zhongshan 2nd Road, Guangzhou 510080, China\nFull list of author information is available at the end of the article","source_license":"CC-BY-4.0","license_restricted":false}