The effect of chronic diseases on the severity of Covid-19 disease. مجلة روافد المعرفة, [S. l.], v. 5, n. 9, p. 155–165, 2025. Disponível em: https://ra.azu.edu.ly/index.php/rawafed-almarefa/article/view/85. Acesso em: 23 يونيو. 2026.