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. - Gupta, Rakhi; Nasar, Nishat (Academia Anesthesiologica International, 2021)