| 1. | Acidosis, Respiratory (1 study) |
| 2. | Airway Obstruction (1 study) |
| 3. | Apnea (36 studies) |
| 4. | Asbestosis (1 study) |
| 5. | Asthma (117 studies) |
| 6. | Asthma, Exercise-Induced (3 studies) |
| 7. | Bronchial Diseases (438 studies) |
| 8. | Bronchial Neoplasms (304 studies) |
| 9. | Bronchiectasis (2 studies) |
| 10. | Bronchiolitis (3 studies) |
| 11. | Bronchiolitis Obliterans (2 studies) |
| 12. | Bronchitis (20 studies) |
| 13. | Bronchitis, Chronic (7 studies) |
| 14. | Bronchopulmonary Dysplasia (16 studies) |
| 15. | Carcinoma, Bronchogenic (1 study) |
| 16. | Ciliary Motility Disorders (1 study) |
| 17. | Coin Lesion, Pulmonary (1 study) |
| 18. | Common Cold (4 studies) |
| 19. | Cough (2 studies) |
| 20. | Cystic Fibrosis (45 studies) |
| 21. | Dyspnea (5 studies) |
| 22. | Hantavirus Pulmonary Syndrome (1 study) |
| 23. | Hay Fever (3 studies) |
| 24. | Histiocytosis, Langerhans-Cell (13 studies) |
| 25. | Hyaline Membrane Disease (1 study) |
| 26. | Influenza (6 studies) |
| 27. | Kartagener Syndrome (1 study) |
| 28. | Laryngeal Diseases (59 studies) |
| 29. | Laryngeal Neoplasms (52 studies) |
| 30. | Lung Diseases (851 studies) |
| 31. | Lung Diseases, Fungal (52 studies) |
| 32. | Lung Diseases, Interstitial (47 studies) |
| 33. | Lung Diseases, Obstructive (160 studies) |
| 34. | Lung Neoplasms (384 studies) |
| 35. | Meconium Aspiration (3 studies) |
| 36. | Mediastinal Diseases (3 studies) |
| 37. | Mediastinal Neoplasms (2 studies) |
| 38. | Nose Diseases (36 studies) |
| 39. | Nose Neoplasms (26 studies) |
| 40. | Paranasal Sinus Diseases (22 studies) |
| 41. | Paranasal Sinus Neoplasms (19 studies) |
| 42. | Pleural Diseases (8 studies) |
| 43. | Pleural Effusion (19 studies) |
| 44. | Pleural Effusion, Malignant (17 studies) |
| 45. | Pleural Neoplasms (7 studies) |
| 46. | Pleuropneumonia (1 study) |
| 47. | Pneumoconiosis (1 study) |
| 48. | Pneumonia (93 studies) |
| 49. | Pneumonia, Aspiration (3 studies) |
| 50. | Pneumonia, Bacterial (4 studies) |
| 51. | Pneumonia, Pneumococcal (2 studies) |
| 52. | Pneumonia, Pneumocystis (56 studies) |
| 53. | Pneumothorax (3 studies) |
| 54. | Pulmonary Alveolar Proteinosis (1 study) |
| 55. | Pulmonary Disease, Chronic Obstructive (44 studies) |
| 56. | Pulmonary Edema (2 studies) |
| 57. | Pulmonary Embolism (10 studies) |
| 58. | Pulmonary Emphysema (17 studies) |
| 59. | Pulmonary Fibrosis (23 studies) |
| 60. | Radiation Pneumonitis (4 studies) |
| 61. | Respiration Disorders (71 studies) |
| 62. | Respiratory Distress Syndrome, Adult (8 studies) |
| 63. | Respiratory Distress Syndrome, Newborn (21 studies) |
| 64. | Respiratory Hypersensitivity (119 studies) |
| 65. | Respiratory Insufficiency (10 studies) |
| 66. | Respiratory System Abnormalities (1 study) |
| 67. | Respiratory Tract Diseases (958 studies) |
| 68. | Respiratory Tract Infections (111 studies) |
| 69. | Respiratory Tract Neoplasms (453 studies) |
| 70. | Rhinitis (7 studies) |
| 71. | Rhinitis, Allergic, Perennial (3 studies) |
| 72. | Sarcoidosis, Pulmonary (1 study) |
| 73. | Severe Acute Respiratory Syndrome (2 studies) |
| 74. | Silicosis (1 study) |
| 75. | Sinusitis (4 studies) |
| 76. | Sleep Apnea Syndromes (35 studies) |
| 77. | Sleep Apnea, Obstructive (6 studies) |
| 78. | Spasmodic Dysphonia (7 studies) |
| 79. | Spastic Dysphonia (7 studies) |
| 80. | Thoracic Diseases (3 studies) |
| 81. | Tuberculosis, Pulmonary (8 studies) |
| 82. | Vocal Cord Paralysis (1 study) |
| 83. | Voice Disorders (8 studies) |
| 84. | Wegener's Granulomatosis (14 studies) |
| 85. | Whooping Cough (5 studies) |
