Fishman, MD, R.L., Kistler, DO, C.J., Ellerbusch, MD, M.T., Aparicio, MD, R.T., Swami, MD, S.S., Shirley, DO, M.E., Jain, MD, A.K., Fortier, MSc, L., Robertson, BScN, S. and Bouchard, MD, PhD, S. 2007. Efficacy and safety of 12 weeks of osteoarthritic pain therapy with once-daily tramadol (Tramadol Contramid® OAD). Journal of Opioid Management. 3, 5 (Sep. 2007), 273–280. DOI:https://doi.org/10.5055/jom.2007.0015.