YILMAZ, U., S. AYAZ, Ç. BAYSAL, B. YILDIRIM, A. ÜLKER, and L. ONARAN. 1994. “THE IMPORTANCE OF REDUCED FREE PROTEIN S LEVELS IN INFLAMMATORY BOWEL DISEASE”. Turkish Journal of Gastroenterology 5 (2):300-304. https://www.turkjgastroenterol.org/index.php/tjg/article/view/417.