Bender, MD, H. U., H.-G. Muench, MD, and C. F. Nussbaum, MD. “Switching a Baby from IV Levomethadone to IV Fentanyl”. Journal of Opioid Management, vol. 17, no. 2, Mar. 2021, pp. 181-3, doi:10.5055/jom.2021.0627.