Comparative effectiveness of continuous subcostal transversus abdominis plane block versus thoracic epidural analgesia in postoperative pain management following major open abdominal surgery: a prospective observational study. Adv Anest Pain Med [Internet]. 2025 Jul. 9 [cited 2025 Jul. 21];1(1). Available from: https://www.aapm-journal.com/site/article/view/53