Keskin, Olgun, Işılay Kalan Sari, Aysegul Seremet Keskin, Hamit Yaşar Ellidağ, and Orbay Harmandar. “Relationship of Angiopoietin-2 Level With the Prognosis of the COVID-19 Disease”. The Journal of Infection in Developing Countries 17, no. 10 (October 31, 2023): 1394–1400. Accessed April 1, 2026. https://www.jidc.org/index.php/journal/article/view/37956369.