Firat, B. T., Gulen, M., Satar, S., Firat, A., Acehan, S., Isikber, C., Kaya, A., Sahin, G. K. and Akoglu, H. (2021) “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(6), pp. 583–590. Available at: https://periodicosapm.emnuvens.com.br/spmj/article/view/551 (Accessed: 10 March 2025).