Letter: Cephalosporins in bronchitis.
D001991:Bronchitis / Q000188:drug therapy*; D002506:Cephalexin / Q000008:administration & dosage / Q000627:therapeutic use*; D002908:Chronic Disease; D002986:Clinical Trials as Topic; D006801:Humans; D010919:Placebos; D013183:Sputum / Q000187:drug effects
D010919:Placebos; D002506:Cephalexin