Fecal and Circulating TNF-a Measurement for Assessment of Disease Activity in Inflammatory Bowel Disease - DOBRUCALI, Ahmet; TUNCER, Murat; TUNCALI ERALP, Yeşim; BAL, Kadir; YURDAKUL, İbrahim; ALTIN, Mehmet; DİNÇ, İsmail; AŞCIOGLU, Fatma (Turkish Journal of Gastroenterology, 1994)