Sanaa Ahmed Eltohamy. “Sacral Multifidus Plane Block Versus Caudal Epidural Block for Postoperative Analgesia in Pediatric Hypospadias Surgery: A Narrative Review”. The International Journal of Multiphysics, vol. 18, no. 3, Sept. 2024, pp. 5759 -73, https://www.themultiphysicsjournal.com/index.php/ijm/article/view/2271.