Retraction Note: BMC Anesthesiol 21, 194 (2021)
https://doi.org/10.1186/s12871-021-01417-3
The Editor has retracted this article because after obtaining approval for this clinical trial from the Institutional Ethical Review Committee for Clinical Trials of The First Affiliated Hospital of Sun Yat-sen University the authors made changes to the protocol without obtaining the Committee's approval. All authors agree to this retraction.
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Niu, L., Chen, L., Luo, Y. et al. Retraction Note: Oxycodone versus morphine for analgesia after laparoscopic endometriosis resection. BMC Anesthesiol 21, 314 (2021). https://doi.org/10.1186/s12871-021-01540-1
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DOI: https://doi.org/10.1186/s12871-021-01540-1