Hopf, Felix, et al. “CD3+ Lymphocytosis in the Peri-Implant Membrane of 222 Loosened Joint Endoprostheses Depends on the Tribological Pairing”. Acta Orthopaedica, vol. 88, no. 6, Nov. 2017, pp. 642-8, doi:10.1080/17453674.2017.1362774.