Duncan, F., Cupitt, J., Haigh, C., Vernon, P., Marshall, J., & Nield, A. (2005). A prospective randomized pragmatic double-blinded comparison of 0.125% and 0.0625% bupivacaine for the management of pain after operation in patients undergoing major abdominal surgery. https://doi.org/10.1016/j.acpain.2005.05.004