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Walk the evidence base by book and chapter — the raw source passages that ground Ask, Differential, and the rest.

• Associations of anxiety and depression with prognosis in chronic obstructive pulmonary disease: A systematic review and meta-analysis1 passage
• High flow through nasal cannula in exacerbated COPD patients: a systematic review1 passage
• Influenza vaccination in older adults and patients with chronic disorders: A position paper from the Portuguese Society of Pulmonology, the Portuguese Society of Cardiology, the Portuguese Society of Diabetology, the Portuguese Society of Infectious Diseases and Clinical Microbiology, the Portuguese Society of Geriatrics and Gerontology, and the Study Group of Geriatrics of the Portuguese Society of Internal Medicine1 passage
• Prevalence of preserved ratio impaired spirometry: A systematic review and meta-analysis1 passage
• Prone position for acute respiratory distress syndrome and the hazards of meta-analysis1 passage
• Respiratory syncytial virus vaccination in older adults and patients with chronic disorders: A position paper from the Portuguese Society of Pulmonology, the Portuguese Association of General and Family Medicine, the Portuguese Society of Cardiology, the Portuguese Society of Infectious Diseases and Clinical Microbiology, the Portuguese Society of Endocrinology, Diabetes and Metabolism, and the Portuguese Society of Internal Medicine1 passage
• Unsupervised physical activity interventions for people with COPD: A systematic review and meta-analysis1 passage