History of the introduction of theophylline into the treatment of asthma.
D000628:Aminophylline / Q000266:history / Q000627:therapeutic use; D000818:Animals; D001249:Asthma / Q000188:drug therapy*; D002417:Cattle; D004358:Drug Therapy / Q000266:history; D005858:Germany; D006666:History of Medicine; D013806:Theophylline / Q000266:history / Q000627:therapeutic use*; D014481:United States
D000628:Aminophylline; D013806:Theophylline