The purpose of this study is to investigate the clinical features and long-term outcome of anti-neutrophil cytoplasmic antibody (ANCA)-positive interstitial lung disease (ILD) and assess the difference between microscopic polyangiitis (MPA) associated ILD and isolated ANCA-positive idiopathic interstitial pneumonia.
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Death From All Causes
Timeframe: From baseline until the date of death from all cause, up to 5 years
Number of Patients Who Underwent Lung Transplantation
Timeframe: From baseline until the date of transplantation, up to 5 years