A retrospective study demonstrating properties of nonvariceal upper gastrointestinal bleeding in Turkey - Bor, Serhat; DAĞLI, Ülkü; SARER, Banu; GÜREL, Selim; TÖZÜN, Nurdan; SİVRİ, Bülent and AKBAŞ, Türkay and ŞAHİN, Burhan and MEMİK, Faruk and; R, Yücel (Turkish Journal of Gastroenterology, 2011)