regional anesthesia nerve block lumbar plexus needle movements probe movements needle ultrasound probe part maneuver thoracic epidural epidural rectus sheath paravertebral spinal anesthesia spinal transversus abdominus test dose tap tap block risks benefits risk/benefit interscalene axillary infraclavicular supraclavicular lateral femoral cutaneous femoral saphenous popliteal parasacral ankle block sciatic obturator
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