SOHAIL BHUTTA , MUZAMIL JAMIL , KAMRAN AZIZ ,WASIM UDDIN. An Etiological Study of Upper Gastrointestinal Bleeding. Journal of Rawalpindi Medical College, Rawalpindi, Pakistan, v. 16, n. 1, 2012. Disponível em: https://www.journalrmc.com/index.php/JRMC/article/view/616. Acesso em: 31 oct. 2025.