CPFE	Combined pulmonary fibrosis and emphysema
CT	Computed tomography
IPF	Idiopathic pulmonary fibrosis
COPD	Chronic obstructive pulmonary disease
CTD	Connective tissue disease
ILD	Interstitial lung disease
RA	Rheumatoid arthritis
SSc	Systemic sclerosis
TLC	Total lung capacity
RV	Residual volume
FVC	Forced vital capacity
FEV1	Forced expiratory volume in 1 s
DLCO	Carbon monoxide diffusion capacity
KCO	Carbon monoxide transfer coefficient
HRCT	High resolution CT
UIP	Usual interstitial pneumonia
fNSIP	Fibrotic nonspecific interstitial pneumonia
DIP	Desquamative interstitial pneumonia
RB	Respiratory bronchiolitis
cHP	Chronic hypersensitivity pneumonitis
fILD	Fibrosing ILD
SRIF	Smoking-related interstitial pneumonitis
LCH	Langerhans cell histiocytosis
PH	Pulmonary hypertension
AEF	Airspace enlargement with fibrosis
BAL	Bronchoalveolar lavage
CXCL	Chemokine (C-X-C motif) ligand
CRP	C-reactive protein
SP-C and -D	Surfactant protein-C and -D
KL-6	Krebs von den Lungen-6
TGF-β	Transforming growth factor β
TNF-α	Tumor necrosis factor α
MMP	Matrix metalloproteinase
mPAP	Mean pulmonary artery pressure
PMF	Progressive massive fibrosis
MP	Microscopic polyangiitis
RAGE	Receptor for advanced glycation end-products
IL-13	Interleukin-13
MHV-68	Mouse gamma herpes virus 68
ROS	Reactive oxygen species
PDGF	Platelet -derived growth factor
ADA	Adenosine deaminase
CPI	Composite physiologic index