Firat, Basak Toptas, Muge Gulen, Salim Satar, Ahmet Firat, Selen Acehan, Cem Isikber, Adem Kaya, Gonca Koksaldi Sahin, and Haldun Akoglu. “Perfusion Index: Could This Be a New Triage Tool for Upper Gastrointestinal System Bleeding in the Emergency Department? A Prospective Cohort Study”. São Paulo Medical Journal 139, no. 6 (November 4, 2021): 583–590. Accessed March 10, 2025. https://periodicosapm.emnuvens.com.br/spmj/article/view/551.