Evaluation of the Efficacy of Intraperitoneal Instillation of Ropivacaine with Dexmedetomidine Versus Ropivacaine with Ketamine for Post Operative Pain Relief following Laparoscopic Cholecystectomy: A Randomized Controlled Study - Kapoor, Ruchi; Dua, Steffi; Saxena, Ashok; Narayan, Shubham (Archives of Anesthesiology and Critical Care, 2023)