title: [A randomized, prospective and comparative study is a clinical trial].
authors.forename: A
authors.initials: A
authors.lastname: Canut Blasco
authors.forename: S
authors.initials: S
authors.lastname: Alvarez Ruiz
authors.forename: J L
authors.initials: JL
authors.lastname: Novales Salcedo
authors.forename: I
authors.initials: I
authors.lastname: Alfonso Farnós
mesh_terms: D000900:Anti-Bacterial Agents / Q000627:therapeutic use; D017963:Azithromycin / Q000627:therapeutic use; D002444:Cefuroxime / Q000627:therapeutic use; D002511:Cephalosporins / Q000627:therapeutic use; D002986:Clinical Trials as Topic; D006801:Humans; D008173:Lung Diseases, Obstructive / Q000188:drug therapy
chemical_list: D000900:Anti-Bacterial Agents; D002511:Cephalosporins; D017963:Azithromycin; D002444:Cefuroxime