Scoping review of six retrospective studies: risk factors associated with the case fatality rate of people infected with Coronavirus (COVID-19) oleh Adel Sadeq, Asim Ahmed Elnour, Farah Hamad Farah, Azza Ramadan, Judit Don, Ahmed Ibrahim Fathelrahman, Maisoun Alkaabi, Mohammed Baraka, Abubakar B Abubakar, Sasha Mohammed Elamin Suliman, Abdulla Al Amoodi, IsraaYousif Khidir, Khalid Awad Al Kubaisi, Nadia Al Mazroui