Abstract:Firstly, six References were omitted. These References are now cited at the relevant points in-text and are listed below:1. United Nations. World Drug Report 2020. Available at https:// wdr. unodc. org/ wdr20 20/ en/ exsum. html (2020). 21. Zheng, H. et al. Cholesterol level influences opioid signaling in cell models and analgesia in mice and humans.
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