The Posterior Cranial Vertical Line: A Novel Radiographic Marker for Classifying Global Sagittal Alignment oleh Paul J. Park, Fthimnir M. Hassan, Xavier E. Ferrer, Cole Morrissette, Nathan J. Lee, Meghan Cerpa, Zeeshan M. Sardar, Michael P. Kelly, Stephane Bourret, Kazuhiro Hasegawa, Hee-Kit Wong, Gabriel Liu, Hwee Weng Dennis Hey, Hend Riahi, Jean-Charles Le Huec, Lawrence G. Lenke