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dy period for patients who chose or were assigned to receive surgery for degenerative spondylolisthesis. In the nonsurgical group, ESI was associated with inferior pain reduction through 3 years, although this was confounded by greater baseline pain. ESI showed little relationship with surgical crossover. Therapeutic Level III. See Instructions for Authors for a complete description of levels of evidence. Therapeutic Level III. See Instructions for Authors for a complete description of levels of evidence.Currently, the coronavirus disea