[Long-term studies on the treatment of chronic bronchitis].
D001991:Bronchitis / Q000188:drug therapy*; D002908:Chronic Disease / Q000188:drug therapy; D005260:Female; D006801:Humans; D008297:Male; D010118:Oxytetracycline / Q000627:therapeutic use*; D013183:Sputum / Q000382:microbiology
D010118:Oxytetracycline
Langzeituntersuchungen zur Behandlung der chronischen Bronchitis.