Frequency of clinical characteristics and factors associated with mortality in patients hospitalized for COVID-19 in Puebla, Mexico. Revista Alergia México, [S. l.], v. 69, n. 2, p. 67–71, 2023. DOI: 10.29262/ram.v69i2.1146. Disponível em: https://ojs.revistaalergia.mx/ojs/index.php/ram/article/view/1146. Acesso em: 23 sep. 2026.