Answer to the letter to the editor of S. Zhang et al. concerning "Continuous wound infusion of ropivacaine for the control of pain after thoracolumbar spinal surgery: a randomized clinical trial" (by Xu B, et al. (2015) Eur Spine J; 24: doi:10.1007/s00586-015-3979-x).
Department of Anesthesiology, General Hospital of Guangzhou Military Command, Guangzhou, 510010, China. xubo333@hotmaill.com.
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