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nerve block regional anesthesia lumbar plexus benefits risk/benefit interscalene axillary infraclavicular supraclavicular lateral femoral cutaneous femoral saphenous popliteal parasacral ankle block sciatic obturator 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