1Abrahams MS,Aziz MF,Fu RF. Ultrasound guidance compared wish electrical neurostimulation for peripheral nerve block;a systematic review and meta-analysis of randomized controlled trials[J].British Journal of Anaesthesia,2009.408-417.
2van Geffen GJ,van den BE,Brank GJ. A prospective randomized trial of ultrasound guided versus nerve stimulation guded distal sciatic nerve block at the popliteal fossa[J].Anaesthesia and Intensive Care,2009.32-37.