Martinez V, Cymerman A, Ammar SB, Fiaud JF, Rapon C, Poindessous F, et al. The analgesic efficiency of combined pregabalin and ketamine for total hip arthroplasty: a randomised, double?blind, controlled study. Anaesthesia 2014;69:46–52. https://doi.org/10.1111/anae.12495.