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Romana Kanwal, Riffat Saeed, Amer Latif, Tooba Ammar, Hussam Ahmad, Saeeda Rana. Comparison Between Effectiveness of Epidural Catheter by Using Two Techniques Air Versus Saline As Pre-Emptive Analgesia in Obstetric Patients. Pakistan Journal of Medical & Health Sciences 2024, 18, 223.