Nisa NU, Butt S, Khan H, Mustafa G. A comparison of bupivacaine with or without tramadol in caudal epidural block for postoperative caudal analgesia in children undergoing lower abdominal surgery under general anesthesia. apic [Internet]. 13Dec.2019 [cited 22Dec.2024];23(3):279-83. Available from: https://apicareonline.com/index.php/APIC/article/view/1136