The level of significance was determined as its “ P ” value with P < 0.05 as statistically significant and P < 0.001 as highly significant at a 95% confidence interval.
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Comparison of the Efficacy of Intraperitoneal Instillation of Butorphanol Versus Nalbuphine as Adjuvants to Ropivacaine for Postoperative Pain Relief in Patients Undergoing Laparoscopic Cholecystectomy Under General Anesthesia: A Randomized, Double-Blind Placebo-Controlled Study.
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