“Perioperative Morbidity and Mortality in Patients Undergoing Elective and Emergency Surgery During COVID-19 Pandemic in a Fourth Level Hospital”. Universitas Medica 64, no. 4 (January 24, 2024). Accessed October 9, 2025. https://revistas.javeriana.edu.co/index.php/vnimedica/article/view/37865.