Bagle, A. G.-, Thatte, W., & Choudhari, S. (2019). Preemptive caudal anaesthesia in children with bupivacaine-tramadol and levobupivacaine-tramadol: a randomized, double-blind, prospective study. Anaesthesia, Pain & Intensive Care, 13-19. Retrieved from https://apicareonline.com/index.php/APIC/article/view/321