Key words: pedicle screw; electromyography; EMG; lumbar spine; cervicothoracic; pedicle subtraction osteotomy; PSO; cervicothoracic kyphosis; sagittal imbalance; cervical deformity; absence of inferior vena cava; deep vein thrombosis; epidural varices; low-back pain; lumbar disc herniation; vascular disorders
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