The factors that causes upper gastrointestinal hemorrhage - ÇETİNKAYA, Hülya and SOYKAN, İrfan and Beyler, Ali Reşit and ÖRMECİ, Necati and GÖREN, Ali and SİPAHİ, Nihat and KESİM, Erol and SÜMER, Negüz and ÖZDEN, Ali and BAHAR, Kadir and et al. (Turkish Journal of Gastroenterology, 1995)