Determinants of poor clinical outcome in patients with influenza pneumonia: A systematic review and meta-analysis. - Arranz-Herrero, Javier; Presa, Jesús; Rius-Rocabert, Sergio; Utrero-Rico, Alberto; Arranz-Arija, José Ángel; Lalueza, Antonio; Escribese, María M; Ochando, Jordi; Soriano, Vicente; Nistal-Villan, Estanislao (International Journal of Infectious Diseases, 2023)