Zare, Mohammad Erfan, Yanzhong Wang, Atefeh Nasir Kansestani, Afshin Almasi, and Jun Zhang. “Procalcitonin Has Good Accuracy for Prognosis of Critical Condition and Mortality in COVID-19: A Diagnostic Test Accuracy Systematic Review and Meta-Analysis”. Iranian Journal of Allergy, Asthma and Immunology 19, no. 6 (December 19, 2020): 557-569. Accessed July 26, 2021.