Examination of the Diameter of the Rectum and the Thickness of the Anterior Wall of the Rectum by Ultrasound in Children With Chronic Constipation and Abdominal Pain in the Age Range of 2-18 Years. - Aldaghi MA; Yazdi NS; Abadi MEA; Mahmoudi R; Lotfi H (JGH open : an open access journal of gastroenterology and hepatology, 2025)