Age > 18 years and <89 years - History of hospitalization for COVID-19 infection documented with positive PCR or positive serology in the previous 2 to 6 months - Lung opacities on HRCT involving more than 10% of the lung volume, with fibrotic features - DLCO≤ 70% predicted

Age > 18 years and <89 years - History of hospitalization for COVID-19 infection documented with positive PCR or positive serology in the previous 2 to 6 months - Lung opacities on HRCT involving more than 10% of the lung volume, with fibrotic features - DLCO≤ 70% predicted