Ahuja, MD, D., N. Choudhary, MD, V. Kumar, MD, N. Gupta, MD, and S. J. Bharati, DM. “Managing Breakthrough Pain for Advanced Malignancy in Elderly Patients: A Real Challenge”. Journal of Opioid Management, vol. 16, no. 3, May 2020, pp. 219-22, doi:10.5055/jom.2020.0571.