van den Beuken-van Everdingen, MD, PhD, M.H.J., Geurts, MSc, J.W. and Patijn, MD, PhD, J. 2013. Prolonged QT interval by methadone: Relevance for daily practice? A prospective study in patients with cancer and noncancer pain. Journal of Opioid Management. 9, 4 (Jul. 2013), 263–267. DOI:https://doi.org/10.5055/jom.2013.0167.