Efficacy of Tocilizumab in Management of COVID-19 Patients Admitted to Intensive Care Units: A Multicenter Retrospective Cohort Study oleh Hoda Younes Ibrahem, Doaa Hamdy Aly, Ahmed E. Abou Warda, Ramadan Abdelmoez Farahat, Raghda Mamdouh Youssef, Mona Hassan Abdelhamid, Heba Ahmed Goud, Rana Ragab Mohamed, Menna Allah Y. Nasr Eldien, Fahad Obaid Alotaibi, Abdulaziz Ibrahim Alzarea, Abdullah Salah Alanazi, Nehal M. Eisa, Abdelrahman SH. Refaee