T. A. Matoushek, PharmD, T. C. Kearney, MD, T. J. Lindsay, MD, FAAFP, and C. M. Herndon, PharmD, BCPS, CPE, FASHP, “Loss of antinociceptive effectiveness of morphine and oxycodone following titration of levothyroxine: Case reports and a brief review of published literature”, J of Opioid Management, vol. 8, no. 3, pp. 193–198, May 2012.