Amornnuratkul, Shalothorn, et al. “Accuracy of Transrectal Ultrasonography in Preoperative Staging of Rectal Cancer”. The ASEAN Journal of Radiology, vol. 16, no. 3, Apr. 2023, pp. 166-80, https://www.asean-journal-radiology.org/index.php/ajr/article/view/855.