title: [Trial of preventive treatment of patients with chronic bronchitis].
mesh_terms: D000368:Aged; D001991:Bronchitis / Q000188:drug therapy / Q000517:prevention & control*; D002908:Chronic Disease; D002986:Clinical Trials as Topic; D004318:Doxycycline / Q000008:administration & dosage / Q000009:adverse effects / Q000627:therapeutic use; D004485:Eczema / Q000139:chemically induced; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D010118:Oxytetracycline / Q000627:therapeutic use*
chemical_list: D004318:Doxycycline; D010118:Oxytetracycline
vernacular_title: Versuch einer prophylaktischen Behandlung chronischer Bronchitiker.