Comments on: Effect of warming bupivacaine 0.5% on ultrasound-guided axillary plexus block. Randomized prospective double-blind study. By Trabelsi W, Gabsia AB, Lebbi A, Sammoud W, Labbène I, Kchelfi S, Ferjani M published in Orthop Traumatol Surg Res 2017;103:71–5