Portenoy, MD, R. K., Raffaeli, MD, W., Torres, MD, L. M., Sitte, T., Deka, MD, A. C., Herrera, MD, I. G., & Wallace, MD, M. S. (2018). Long-term safety, tolerability, and consistency of effect of fentanyl pectin nasal spray for breakthrough cancer pain in opioid-tolerant patients. Journal of Opioid Management, 6(5), 319–328. https://doi.org/10.5055/jom.2010.0029