European Journal of Epidemiology · 2001 · 97 citations · 15 references
MedicineClinical SciencesInternal MedicineGeneral Internal MedicineHealth Services ResearchPulmonologyChronic DiseaseChronic Obstructive Pulmonary DiseaseComorbidityComorbidity AssessmentObstructive Lung DiseaseRespiratory DiseaseChronic Obstructive Pulmonary Disease AssessmentChronic Obstructive Pulmonary Disease EpidemiologyPulmonary Symptom Assessment
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