Organizing a general-practitioner therapeutical trial.
D000293:Adolescent; D000328:Adult; D000336:Aerosols; D000420:Albuterol / Q000627:therapeutic use; D001249:Asthma / Q000188:drug therapy; D001991:Bronchitis / Q000188:drug therapy; D002986:Clinical Trials as Topic; D004311:Double-Blind Method; D004739:England; D005194:Family Practice; D005260:Female; D006801:Humans; D009241:Ipratropium / Q000627:therapeutic use; D008297:Male; D008875:Middle Aged; D011897:Random Allocation; D012907:Smoking
D000336:Aerosols; D009241:Ipratropium; D000420:Albuterol