<https://pubs.asahq.org/anesthesiology/article/96/4/NA/42931/POOLED-ANALYSIS-OF-RANDOMIZED-TRIALS-OF-EPIDURAL>
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<https://pubs.asahq.org/anesthesiology/article/96/4/NA/42931/POOLED-ANALYSIS-OF-RANDOMIZED-TRIALS-OF-EPIDURAL>