Intraoperative analgesia with magnesium sulfate versus remifentanil guided by plethysmographic stress index in post-bariatric dermolipectomy: a randomized study - Silva Filho, S. E; Dainez, S; Gonzalez, M. A. M. C; Angelis, F; Vieira, Joaquim Edson; Sandes, C. S (Anesthesiology research and practice, 2022)