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Obeid, I., Bourghli, A. & Vital, JM. Pedicle subtraction osteotomy for postoperative flat back and sagittal imbalance. Eur Spine J 21, 1218–1219 (2012). https://doi.org/10.1007/s00586-012-2359-z
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DOI: https://doi.org/10.1007/s00586-012-2359-z