Sherif, A. M., Mona, Y. H., Sara, A. K., Ayman, M. H., Mohamed, S. A. (2023). Perfusion index as a predictor of hypotension after induction of general anesthesia in elderly patients – a prospective observational study. Egyptian Journal of Anaesthesia. https://doi.org/10.1080/11101849.2023.2238524