Mortality comparison between the first and second/third waves among 3,795 critical COVID-19 patients with pneumonia admitted to the ICU: A multicentre retrospective cohort study by Raquel Carbonell, Silvia Urgelés, Alejandro Rodríguez, María Bodí, Ignacio Martín-Loeches, Jordi Solé-Violán, Emili Díaz, Josep Gómez, Sandra Trefler, Montserrat Vallverdú, Josefa Murcia, Antonio Albaya, Ana Loza, Lorenzo Socias, Juan Carlos Ballesteros, Elisabeth Papiol, Lucía Viña, Susana Sancho, Mercedes Nieto, Maria del Carmen Lorente, Oihane Badallo, Virginia Fraile, Fernando Arméstar, Angel Estella, Laura Sanchez, Isabel Sancho, Antonio Margarit, Gerard Moreno

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