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Ulrich, Nils H., Jakob M. Burgstaller, Florian Brunner, François Porchet, Mazda Farshad, Giuseppe Pichierri, Johann Steurer, and Ulrike Held. The Impact of Incidental Durotomy On the Outcome of Decompression Surgery in Degenerative Lumbar Spinal Canal Stenosis: Analysis of the Lumbar Spinal Outcome Study (LSOS) Data—a Swiss Prospective Multi-center Cohort Study. BioMed Central, 2016.

Ulrich, Nils H., et al. The Impact of Incidental Durotomy On the Outcome of Decompression Surgery in Degenerative Lumbar Spinal Canal Stenosis: Analysis of the Lumbar Spinal Outcome Study (LSOS) Data—a Swiss Prospective Multi-center Cohort Study. BioMed Central, 2016.