Kucukakkas, O., T. Aydin, and M. Ali Gultekin. “Ultrasonographic Evaluation of Gastrointestinal System Involvement in Chronic Inflammatory Rheumatic Diseases”. Annals of Medical Research, vol. 27, no. 6, May 2021, pp. 1776-85, http://www.annalsmedres.org/index.php/aomr/article/view/800.