Knowledge and attitudes toward COVID-19 vaccination in Sudan: A cross-sectional study oleh Safaa Badi, Loai Abdelgadir Babiker, Abdullah Yasseen Aldow, Almigdad Badr Aldeen Abas, Mazen Abdelhafiez Eisa, Mohamed Nour Abu-Ali, Wagass Abdelrhman Abdella, Mohamed Elsir Marzouq, Musaab Ahmed, Abubakr Ali M Omer, Mohamed H Ahmed