Nisa, N.U., Butt, S., Khan, H. and Mustafa, G. 2019. 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. Anaesthesia, Pain & Intensive Care. 23, 3 (Dec. 2019), 279-283. DOI:https://doi.org/10.35975/apic.v23i3.1136.