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APA Citation
Carrell, D. S., Cronkite, D., Palmer, R. E., Saunders, K., Gross, D. E., Masters, E. T., Hylan, T. R., & Von Korff, M. (n.d.). using natural language processing to identify problem usage of prescription opioids. International journal of medical informatics, 84(12), 1057–1064. http://access.bl.uk/ark:/81055/vdc_100029216210.0x00000d