Comparison of local anaesthetic versus saline erector spinae plane block for perioperative opioid consumption and postoperative pain in open posterior spine surgeries - A randomised controlled trial. - Mahendranath, Musunuru; Shwethashri, Kondavagilu R.; Uppar, Alok; Chakrabarti, Dhritiman; Sriganesh, Kamath (Indian Journal of Anaesthesia, 2026)