3. IPF diagnosed, according to the 2011 ATS/ERS/JRS/ALAT IPF guidelines for diagnosis and management, within 5 years and reaffirmed applying 2011 Guidelines (P11-07084) if diagnosed >2 years and up to 5 year from Visit 1,. Diagnosis must be confirmed by chest HRCT taken within 24 months of Visit 1. All HRCT results reported to be possible or inconsistent usual interstitial pneumonia (UIP) must have confirmatory pathology.