S. K. Aggarwal, PhD, G. T. Carter, MD, MS, M. D. Sullivan, MD, PhD, C. ZumBrunnen, PhD, R. Morrill, PhD, and J. D. Mayer, PhD, “Medicinal use of cannabis in the United States: Historical perspectives, current trends, and future directions”, J of Opioid Management, vol. 5, no. 3, pp. 153–168, Jan. 2018.