Letter: Chronic sinusitis.
D002908:Chronic Disease; D002981:Clindamycin / Q000009:adverse effects / Q000627:therapeutic use; D006801:Humans; D008034:Lincomycin / Q000009:adverse effects / Q000627:therapeutic use; D010406:Penicillins / Q000627:therapeutic use; D012852:Sinusitis / Q000188:drug therapy*; D013752:Tetracycline / Q000627:therapeutic use
D010406:Penicillins; D002981:Clindamycin; D008034:Lincomycin; D013752:Tetracycline