Issue 4¿Impact of air pollution on COVID-19 mortality and morbidity: An epidemiological and mechanistic review Hasan Bayram; Nur Konyalilar; Muge Akpinar Elci; Hadi Rajabi; G. Tu¿e Aksoy; Deniz Mortazavi; Özgecan Kayalar; Öner Dikensoy; Luis Taborda-Barata; Giovanni Viegi;

Hyperoxemia in invasively ventilated COVID¿19 patients¿Insights from the PRoVENT¿COVID study A.M. Tsonas; D.M. van Meenen; M. Botta; G.S. Shrestha; O. Roca; F. Paulus; A.S. Neto; M.J. Schultz;

Association between respiratory distress time and invasive mechanical ventilation in COVID-19 patients: A multicentre regional cohort study S. Busani; I. Coloretti; M. Baciarello; V. Bellini; M. Sarti; E. Biagioni; R. Tonelli; A. Marchioni; E. Clini; G. Guaraldi; C. Mussini; M. Meschiari; T. Tonetti; L. Pisani; S. Nava; E. Bignami; M.V. Ranieri; M. Girardis;