| Abbreviations | Meaning |
 | HEL | Hen Egg White Lysozyme; Human Embryonic Lung; Human Erythroleukemia |
 | IPPHS | International Primary Pulmonary Hypertension Study |
 | PBAL | Protected Bronchoalveolar Lavage |
 | XPTB | Extrapulmonary Tuberculosis |
 | DPD | Diffuse Pulmonary Disease |
 | RALPH | Renal-anal-lung-polydactylyhamartoblastoma [syndrome] |
 | RBL-ILD | Respiratory Bronchiolitis With Associated Interstitial Lung Disease |
 | BNA | Basle Nomina Anatomica; Bronchoscopic Needle Aspiration |
 | BFL | Bird Fancier's Lung; Brjeson-Forssman-Lehman [syndrome] |
 | BRO | Bronchiolitis Obliterans; Bronchoscopy |
 | IASLC | International Association For The Study Of Lung Cancer |
 | SPCA | Systemic Pulmonary Collateral Artery |
 | CNSLD | Chronic Nonspecific Lung Disease |
 | RMAX,L | Maximum Resistance, Lung |
 | PAIVS | Pulmonary Atresia With Intact Ventricular Septum [collaborative Study] |