Tocilizumab in severe COVID-19 – A randomized, double-blind, placebo-controlled trial oleh Muhammad Irfan Malik, Sardar Al Fareed Zafar, Fabiha Qayyum, Muna Malik, Muhammad Sohaib Asghar, Muhammad Junaid Tahir, Ammarah Arshad, Fatima Khalil, Hafiza Shafia Naz, Mudassar Aslam, Jodat Saleem, Abdul Aziz, Mustafa Usman Azhar, Muhammad Naqash, Zohaib Yousaf