Birthi, MD, Pravardhan, Vittal R. Nagar, MD, Robert Nickerson, MD, and Paul A. Sloan, MD. 2015. “Hypogonadism Associated With Long-Term Opioid Therapy: A Systematic Review”. Journal of Opioid Management 11 (3):255-78. https://doi.org/10.5055/jom.2015.0274.