Procalcitonin Has Good Accuracy for Prognosis of Critical Condition and Mortality in COVID-19: A Diagnostic Test Accuracy Systematic Review and Meta-analysis - Zare, Mohammad Erfan; Wang, Yanzhong; Nasir Kansestani, Atefeh; Almasi, Afshin; Zhang, Jun (Iranian Journal of Allergy, Asthma and Immunology, 2020)