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Diagnostic approaches. IPF: idiopathic pulmonary fibrosis; HRCT: high-resolution computed tomography; CXR: chest radiograph; DLCO: diffusing capacity of the lung for carbon monoxide; FVC: forced vital capacity; PET-CT: positron emission tomography/computed tomography; EBUS-TBNB: endobronchial ultrasound/transbronchial needle biopsy; SLB (VATS): surgical lung biopsy (video-assisted thoracoscopic surgery).
