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Non-medical use of painkillers in the USA.
Lancet 378(9804):1677 (2011) PMID 22078670
DOI: 10.1016/S0140-6736(11)61723-6
Version: za2963e q8za8 q8zb9 q8zc3 q8zd7 q8zed q8zff q8zgf
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