Spine
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Retrospective observational study. ⋯ 3.
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Retrospective cohort study using prospectively collected data. ⋯ 3.
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Retrospective observational cohort study. ⋯ 3.
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Randomized Controlled Trial Multicenter Study
Postoperative Single-shot Epidural Fentanyl and Bupivacaine for Postoperative Analgesia After Lumbar Decompression: A Prospective, Double-blind Randomized Study.
Randomized clinical trial. ⋯ 2.