title: A prospective study on chronic respiratory disease in children. I. Aim and methods, results of the first year.
mesh_terms: D000367:Age Factors; D000397:Air Pollution; D001249:Asthma / Q000175:diagnosis / Q000453:epidemiology; D001991:Bronchitis / Q000453:epidemiology; D002648:Child; D003371:Cough / Q000453:epidemiology; D004417:Dyspnea / Q000453:epidemiology; D005260:Female; D006632:Histamine / Q000097:blood; D006801:Humans; D008173:Lung Diseases, Obstructive / Q000175:diagnosis / Q000453:epidemiology*; D008297:Male; D009426:Netherlands; D011379:Prognosis; D011446:Prospective Studies; D011627:Puberty; D012882:Skin Tests; D014505:Urban Population
chemical_list: D006632:Histamine