Safety and Efficacy of Convalescent Plasma to Treat Severe COVID-19: Protocol for the Saudi Collaborative Multicenter Phase II Study oleh Albalawi, Mohammed, Zaidi, Syed Ziauddin Ahmed, AlShehry, Nawal, AlAskar, Ahmed, Zaidi, Abdul Rehman Zia, Abdallah, Rania Nagib Mohammed, Salam, Abdul, AlSagheir, Ahmed, AlMozain, Nour, Elgohary, Ghada, Batarfi, Khalid, Alfaraedi, Alia, Khojah, Osamah, Al-Ansari, Rehab, Alfaraj, Mona, Dayel, Afra, Al Bahrani, Ahmed, Abdelhameed, Arwa Nabhan, Alhumaidan, Hind, Al-Otaibi, Jawaher M, Radwi, Ghazala, Raizah, Abdulrahman, Shatry, Hind, Alsaleh, Sara, AlZahrani, Hazzaa, Al-Hashmi, Hani