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Nielsen, Suzanne, Picco, Louisa, Farrell, Michael, Lintzeris, Nicholas, Le Foll, Bernard, Murnion, Bridin, Winters, Bryony, Matheson, Justin, Graham, Myfanwy, Campbell, Gabrielle, Parvaresh, Laila, Khor, Kok-Eng, Betz-Stablein, Brigid. Nature Publishing Group; 2022. Opioid-sparing effect of cannabinoids for analgesia: an updated systematic review and meta-analysis of preclinical and clinical studies.