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Qualitative case study of needle exchange programs in the Central Appalachian region of the United States. 

Davis SM, Davidov D, Kristjansson AL, Zullig K, Baus A, Fisher M (2018) 

PLoS ONE 13(10): e0205466. doi.org/10.1371/journal.pone.0205466

https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0205466