“Can postoperative atelectasis be prevented by local bupivacaine infusion/infiltration after emergency upper midline laparotomy? Randomized clinical trial ”, Ann Med Res , vol. 26, no. 9, pp. 1820–1824, May 2021, Accessed: Apr. 04, 2025. [Online]. Available: http://annalsmedres.org/index.php/aomr/article/view/1731