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APA Citation
Cepeda, M. S., Fife, D., Berwaerts, J., Friedman, A., Yuan, Y., & Mastrogiovanni, G. (n.d.). doctor shopping for medications used in the treatment of attention deficit hyperactivity disorder: shoppers often pay in cash and cross state lines. American journal of drug and alcohol abuse, 41, 226–229. http://access.bl.uk/ark:/81055/vdc_100025193098.0x00004e