Prospective validation of the Glasgow Blatchford scoring system in patients with upper gastrointestinal bleeding in the emergency department - KÖKSAL, Özlem; ÖZEREN, Gülden; ÖZDEMİR, Fatma and ARMAĞAN, Erol and AYDIN, Şule and AYYILDIZ, Talat (Turkish Journal of Gastroenterology, 2012)