Cepeda, MD, PhD, M. S., Fife, MD, D., Berlin, ScD, J. A., Mastrogiovanni, BS, G. and Yuan, PhD, Y. (2012) “Characteristics of prescribers whose patients shop for opioids: Results from a cohort study”, Journal of Opioid Management, 8(5), pp. 285–291. doi: 10.5055/jom.2012.0128.