The efficacy and effectiveness of the COVID-19 vaccines in reducing infection, severity, hospitalization, and mortality: a systematic review oleh Ibrahim Mohammed, Areej Nauman, Pradipta Paul, Sanjith Ganesan, Kuan-Han Chen, Syed Muhammad Saad Jalil, Shahd H. Jaouni, Hussam Kawas, Wafa A. Khan, Ahamed Lazim Vattoth, Yasmeen Alavi Al-Hashimi, Ahmed Fares, Rached Zeghlache, Dalia Zakaria