CHRONIC RESPIRATORY DISEASE. COMPARISON OF TWO SYMPTOM QUESTIONNAIRES.
D004739:England; D004813:Epidemiology; D006306:Health Surveys; D006801:Humans; D012120:Respiration Disorders; D012140:Respiratory Tract Diseases; D011795:Surveys and Questionnaires
ENGLAND; EPIDEMIOLOGY; HEALTH SURVEYS; RESPIRATORY TRACT DISEASES