Manouchehrian N, Sanatkar M, Kimiaei Asadi H, Soleimani E, Moradi A. A Comparative Study on the Effect of Intravenous Hydrocortisone and Ketamine on Reducing Shivering after Spinal Anesthesia in Cesarean Section: A Double-blind Randomized Controlled Trial. Arch Anesth & Crit Care. 2018;4(2):459-463.