Gupta, R., and N. Nasar. “Comparison of Dexamethasone and Dexmedetomidine As an Adjuvant to 0.375% Ropivacaine in Erector Spinae Plane Block for Lumbar Spine Surgery: A Randomized, Double-Blind, Placebo-Control Trial.”. Academia Anesthesiologica International, Vol. 6, no. 1, Feb. 2021, pp. 1-4, https://aijournals.com/index.php/aan/article/view/1882.