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APA Citation
Freeman, T. P., Craft, S., Wilson, J., Stylianou, S., ElSohly, M., Di Forti, M., & Lynskey, M. T. (2021). changes in delta‐9‐tetrahydrocannabinol (THC) and cannabidiol (CBD) concentrations in cannabis over time: systematic review and meta‐analysis. Addiction, 116, 1000–1010. http://access.bl.uk/ark:/81055/vdc_100127439987.0x00002f