B. J. Morasco, PhD, E. E. Krebs, MD, MPH, R. Cavanagh, MS, S. Hyde, MA, A. Crain, MSW, and S. K. Dobscha, MD, “Treatment changes following aberrant urine drug test results for patients prescribed chronic opioid therapy”, J of Opioid Management, vol. 11, no. 1, Jan. 2015.