Therapeutic plasma exchange followed by convalescent plasma transfusion in critical COVID-19—An exploratory study oleh Vinod Jaiswal, Prashant Nasa, May Raouf, Megha Gupta, Hany Dewedar, Hozaifah Mohammad, Zeyad Al Rais, Mohamed Ali Baqer, Asad Alsabbah, Yasser Ibrahim, Mohamed Salem, Demme Shammass, Mahmoud Marashi