[CONTRIBUTION TO THE PREVENTION OF CHRONIC BRONCHITIS AND BRONCHIAL ASTHMA].
D000941:Antigens; D001249:Asthma; D001688:Biological Products; D001991:Bronchitis; D029481:Bronchitis, Chronic; D002648:Child; D004809:Ephedrine; D006801:Humans; D007223:Infant
D000941:Antigens; D001688:Biological Products; D004809:Ephedrine
ANTIGENS; ASTHMA; BIOLOGICAL PRODUCTS; BRONCHITIS; CHILD; EPHEDRINE; INFANT