THE CORRELATION OF ENDOSCOPIC AND ULTRASONOGRAPHIC FINDINGS IN PATIENTS WITH PORTAL HYPERTENSION - ONAT, Osman; SERHATLIOĞLU, Selami; DEMİR, Ali and DÖNDER, Emir and AYHAN, Oğuz and ÖZERCAN, Reşat and YILDIRIM, Ahmet (Turkish Journal of Gastroenterology, 1993)