HUSSAIN, A.; SABIR, H.; ABBAS, S. A. Development of a severity assessment score for COVID-19: COVID Severity Score (CSS) at the time of admission to hospital. Pakistan Journal of Chest Medicine, [S. l.], v. 29, n. 1, p. 30–35, 2022. Disponível em: http://pjcm.net/index.php/pjcm/article/view/769. Acesso em: 25 may. 2026.