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PRAVEEN KUMAR; BHUPENDRA SINGH; HARSHA D; VIKRAM SINGH RATHORE. A COMPARISON OF EFFICACY OF EPIDURAL BUTORPHANOL AND FENTANYL FOR POST-OPERATIVE PAIN ANALGESIA IN LOWER ABDOMINAL AND LOWER LIMB SURGERIES UNDER EPIDURAL ANESTHESIA: A PROSPECTIVE RANDOMIZED DOUBLE-BLINDED STUDY. Asian J Pharm Clin Res 2024, 17, 38-42.