Wallace, MD, Mark, Dwight E. Moulin, MD, Richard L. Rauck, MD, Sarita Khanna, PhD, Iulia Cristina Tudor, PhD, Roman Skowronski, MD, and John Thipphawong, MD. 2018. “Long-Term Safety, Tolerability, and Efficacy of OROS® Hydromorphone in Patients With Chronic Pain”. Journal of Opioid Management 5 (2):97-105. https://doi.org/10.5055/jom.2009.0011.