Sailo S, Zodinpuia M, P. N. Study of morphine with ropivacaine and ropivacaine alone for caudal epidural analgesia in children. Int Surg J [Internet]. 2020 Feb. 26 [cited 2026 Apr. 16];7(3):781-6. Available from: https://www.ijsurgery.com/index.php/isj/article/view/5718