Supplementary_Material for The Barrow Biomimetic Spine: Face, Content, and Construct Validity of a 3D-Printed Spine Model for Freehand and Minimally Invasive Pedicle Screw Insertion by Michael A. Bohl, Rohit Mauria, James J. Zhou, Michael A. Mooney, Joseph D. DiDomenico, Sarah McBryan, Claudio Cavallo, Peter Nakaji, Steve W. Chang, Juan S. Uribe, Jay D. Turner, and U. Kumar Kakarla in Global Spine Journal