Three-Dimensional-Printed Titanium Versus Polyetheretherketone Cages for Lumbar Interbody Fusion: A Systematic Review of Comparative In Vitro, Animal, and Human Studies oleh Neal A. Patel, Sinead O’Bryant, Christopher D. Rogers, Sachiv Chakravarti, Julian Gendreau, Nolan J. Brown, Zach A. Pennington, Neill B. Hatcher, Luis Daniel Diaz-Aguilar, Martin H. Pham