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APA Citation
Baron, R., Shuman, W., Neifert, S. N., Chapman, E. K., Gilligan, J., Schupper, A. J., Gal, J., & Caridi, J. M. (n.d.). the Use of the American Society of Anesthesiologists (ASA) Classification System in Evaluating Outcomes and Charges Following Deformity Spine Procedures. Neurosurgery, 67, . http://access.bl.uk/ark:/81055/vdc_100117125859.0x000046