Treatment of Postmastectomy Pain with Ambulatory Continuous Paravertebral Nerve Blocks, A Randomized, Triple - Masked, Placebo-Controlled Study

and

Double-blinded, Placebo-controlled, Prospective Randomized Trial Evaluating the Efficacy of Paravertebral Block with and Without Continuous Parravertebral Block Analgesia in Outpatient Breast Cancer.