Friedrichsdorf, MD, FAAP, S. J., A. C. Postier, MPH, L. P. Foster, MEd, T. A. Lander, MD, R. J. Tibesar, MD, Y. Lu, MS, and J. D. Sidman, MD. “Tramadol Versus codeine/Acetaminophen After Pediatric Tonsillectomy: A Prospective, Double-Blinded, Randomized Controlled Trial”. Journal of Opioid Management, vol. 11, no. 4, July 2015, pp. 283-94, doi:10.5055/jom.2015.0277.