Eichenbaum, PhD, G.; Göhler, MD, K.; Etropolski, MD, M.; Steigerwald, MD, PhD, I.; Pergolizzi, MD, J.; Kim, PhD, MA, M.; Vorsanger, PhD, MD, G. Does Tapentadol Affect Sex Hormone Concentrations Differently from Morphine and Oxycodone? An Initial Assessment and Possible Implications for Opioid-Induced Androgen Deficiency. J of Opioid Management 2015, 11, 211-227.