Monitoring severe COVID-19 in Spain: comparison of three systems in the 2021/22 and 2022/23 seasons. Boletín Epidemiológico Semanal, Madrid, v. 31, n. 2, 2023. DOI: 10.4321/s2173-92772023000200003. Disponível em: //revista.isciii.es/index.php/bes/article/view/1298. Acesso em: 10 feb. 2026.