title: [Methodology of surveys on chronic bronchitis. Results of a pilot survey on 3 groups of population].
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D001991:Bronchitis / Q000453:epidemiology*; D002648:Child; D002675:Child, Preschool; D002908:Chronic Disease; D005260:Female; D006306:Health Surveys; D006801:Humans; D008297:Male; D008499:Medical Records; D008875:Middle Aged; D010865:Pilot Projects; D013030:Spain; D011795:Surveys and Questionnaires
vernacular_title: Metodologia de las encuestas sobre la bronquitis cronica, Resultados de una encuesta piloto en tres grupos de poblacion