Utility of Seated Lateral Radiographs in the Diagnosis and Classification of Lumbar Degenerative Spondylolisthesis oleh Tariq Z. Issa, Yunsoo Lee, Emily Berthiaume, Mark J. Lambrechts, Caroline Zaworski, Qudratallah S. Qadiri, Henley Spracklen, Richard Padovano, Jackson Weber, John J. Mangan, Jose A. Canseco, Barrett I. Woods, I. David Kaye, Alan S. Hilibrand, Christopher K. Kepler, Alexander R. Vaccaro, Gregory D. Schroeder, Joseph K. Lee