Sali, Shahnaz, et al. “Effects of Adding Convalescent Plasma Therapy for Treatment of COVID-19 Patients With Severe and Critical Symptoms: A Descriptive Study of 12 Cases ”. Novelty in Biomedicine, vol. 9, no. 2, June 2021, pp. 39-45, doi:10.22037/nbm.v9i2.32319.