| Epidemiology of Airway Responsiveness (NCT00005284) | National Heart, Lung, and Blood Institute (NHLBI) | 1985-01-01 |
| Lung Health Study (LHS) I and III (NCT00000568) | National Heart, Lung, and Blood Institute (NHLBI) | 1984-09-01 |
| Prospective Evaluation of Airways Reactivity (NCT00005282) | National Heart, Lung, and Blood Institute (NHLBI) | 1981-12-01 |
| Early Risk Predictors For Chronic Pulmonary Disease (NCT00005281) | National Heart, Lung, and Blood Institute (NHLBI) | 1977-09-01 |
| Clinical Study of Intermittent Positive Pressure Breathing (IPPB) (NCT00000565) | National Heart, Lung, and Blood Institute (NHLBI) | 1976-11-01 |
| Nocturnal Oxygen Therapy (NCT00000564) | National Heart, Lung, and Blood Institute (NHLBI) | 1976-07-01 |
| The Copenhagen City Heart Study (NCT02993172) | Bispebjerg Hospital | 1976-01-01 |
| Specialized Center of Research in Occupational and Immunologic Lung Disease (NCT00005280) | National Heart, Lung, and Blood Institute (NHLBI) | 1972-06-01 |
| Tucson Epidemiology Study of Chronic Obstructive Lung Diseases (NCT00005279) | National Heart, Lung, and Blood Institute (NHLBI) | 1971-06-01 |
| Honolulu Heart Program (NCT00005123) | National Heart, Lung, and Blood Institute (NHLBI) | 1965-07-01 |
| Measurement of Soluble Factors and Particulate Matter in Induced Sputum and EBC in Inflammatory Diseases of the Lung (NCT00511290) | Tel-Aviv Sourasky Medical Center | |
| Anticipatory & Preventive Team Care (APTCare): At Risk Patients of Family Health Networks (NCT00238836) | C. T. Lamont Primary Care Research Centre | |
| An Evaluation of Home-Based Telemedicine Services (NCT00105846) | US Department of Veterans Affairs | |
| Study to Evaluate Safety and Efficacy of Inhaled Bimosiamose for the Treatment of Patients With Moderate to Severe Chronic Obstructive Pulmonary Disease (COPD) (NCT01108913) | Revotar Biopharmaceuticals AG | |
| Study in Patients With COPD (NCT00215423) | Dey | |
| Cost-Effectiveness of Lung Volume Reduction Surgery (NCT00013156) | US Department of Veterans Affairs | |
| A Prospective, Observational Study of COPD Patients in U.S. Hospitals (NCT02406534) | EPI-Q | |
| The PALP™-COPD Trial (Low-Flow CO2-Removal (ECCO2-R) in Exacerbated COPD) (NCT02107222) | Maquet Cardiopulmonary GmbH | |