Ahmed Uddin Soomro, Imran Ali, Zaheer Ahmed, Khawar Aziz, Kelash Kumar, Imran Hafeez. The Efficacy of a Caudal Bupivacaine and Bupivacaine-Tramadol Combination for Postoperative Analgesia in Pediatric Lower Abdominal Surgeries. Pakistan Journal of Medical & Health Sciences 2023, 17, 493.