RecruitingCohort of IPF Patients Experiencing an ExacerbationExtension of the PFBIO cohort which includes patients with newly diagnosed idiopathic pulmonary fibrosis (IPF) for longitudinal follow-up for up to 5 years. In the PFBIO-EXA extension, patients are included if they experience an exacerbation, or other increase in respiratory symptoms requiring hospital admission, for further collection of clinical and biological data.