Ihsan, Hussain Rashid, et al. “SENSITIVITY AND SPECIFICITY OF ULTRASONOGRAPHY IN CASES OF SUSPECTED ACUTE APPENDICITIS; RESULTS OF A CROSS-SECTIONAL SURVEY”. Pakistan Armed Forces Medical Journal, vol. 67, no. Suppl-3, Aug. 2017, pp. S287-91, https://mail.pafmj.org/index.php/PAFMJ/article/view/4577.