IJSR International Journal of Scientific Research 2277 - 8179 Indian Society for Health and Advanced Research ijsr-13-3-54927 Original Research Paper A Comparative Study Of Greater Auricular Nerve Block Versus Intravenous Fentanyl For Postoperative Pain Relief Following Tympanomastoid Surgeries Vikas Mishra Dr. Dr. Raj Gautam Srivastava Dr. Dr. Puspinder Singh Dr. March 2024 13 3 01 02