Leesa Misra, et al. “Retaining the Epigastric Trocar, until Rest All Ports Closed Decreases Post-Operative Shoulder Pain in Laparoscopic Cholecystectomy Patients”. Asian Journal of Medical Sciences, vol. 14, no. 4, Apr. 2023, pp. 219-21, https://nepjol.info/index.php/AJMS/article/view/51313.