Etropolski, MD, M., B. Lange, MD, MSc, J. Goldberg, PhD, A. Steup, Dipl.-Stat., and C. Rauschkolb, MD, PhD. “A Pooled Analysis of Patient-Specific Factors and Efficacy and Tolerability of Tapentadol Extended Release Treatment for Moderate to Severe Chronic Pain”. Journal of Opioid Management, vol. 9, no. 5, Sept. 2013, pp. 343-56, doi:10.5055/jom.2013.0177.