Mason, MD, Jay W., Ullrich S. Schwertschlag, MD, PhD, Vicki Klutzaritz, BS, and Daniel M. Canafax, PharmD. 2014. “Electrocardiographic and Cardiovascular Diagnostic Characteristics of Patients Receiving Long-Term Opioid Therapy for Pain”. Journal of Opioid Management 10 (2):103-9. https://doi.org/10.5055/jom.2014.0199.