Ultrasound-guided Suprainguinal Fascia Iliaca Block for Postoperative Analgesia in Patients Undergoing Femur Fracture Surgery: A Randomized Control Trial Study Comparing Bupivacaine (0.25%) and Bupivacaine (0.125%) - Shadab Ahmed; Sourabh Kumar; Ekramul Haque; Vishwanath Kumar; Shio Priye (Annals of African Medicine, 2026)