Assessing the variation and drivers of cost in 1-level lumbar fusion: a time-driven activity-based costing analysis von Bernstein, David N., Hammoor, Bradley T., Clements, Chierika Ukogu, Tobert, Daniel G., Cha, Thomas D., Aidlen, Jessica P., Hershman, Stuart H., Bono, Christopher M., Fogel, Harold A.

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