Ayub, A., Talawar, P., Kumar, R., Bhoi, D., Singh, A. Y. (2018). 'Erector Spinae Block a safe, simple and effective analgesic technique for major hepatobiliary surgery with thrombocytopenia', Egyptian Journal of Anaesthesia, 34(4), pp. 169-172. doi: 10.1016/j.egja.2018.08.001