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Effects of the new prescribing standards in British Columbia on consumption of opioids and benzodiazepines and z drugs. 

Crabtree A, Rose C, Chong M, Smolina K. 

Can Fam Physician. 2019;65(5):e231-e237.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6516682/