F. L. Beaudoin, MD, MS, G. N. Banerjee, MPH, and M. J. Mello, MD, MPH, “State-level and system-level opioid prescribing policies: The impact on provider practices and overdose deaths, a systematic review”, J of Opioid Management, vol. 12, no. 2, pp. 109–118, Mar. 2016.