Danis N, Tekin F, Akarca US, ?nal NG, Isik Erdogan E, Akat K, Demirkoparan ?, Karasu Z, Turan I, Oru? N, Aydin A, Ers?z G, Vardar R, ?z?temiz ?, G?nsar F. Changing patterns of upper gastrointestinal bleeding over 23 years in Turkey. Turk J Gastroenterol. 2019 Oct; 30(10):877-882.