Dr. Manoj Kantilal Parikh. 2015. “A PROSPECTIVE STUDY TO ASSESS THE EFFECTIVENESS OF PRE-EMPTIVE ANALGESIA USING TRAMADOL VERSUS FENTANYL ON POST-OPERATIVE PAIN MANAGEMENT IN ORTHOPEDIC SURGERY PATIENTS”. Journal of Population Therapeutics and Clinical Pharmacology 22 (3): 330-43. https://doi.org/10.53555/78rxx503.