Block, A. R., Ben-Porath, Y. S., & Marek, R. J. (2013). Psychological risk factors for poor outcome of spine surgery and spinal cord stimulator implant: A review of the literature and their assessment with the MMPI-2-RF. The Clinical Neuropsychologist, 27(1), 81–107. https://doi.org/10.1080/13854046.2012.721007