Johnston, R N <br/><br/>
Five-year winter chemoprophylaxis for chronic bronchitis.  [electronic resource] 

 -  British medical journal  Nov 1969 
 - 265-9 p.  digital 
<br/><br/> Publication Type: Clinical Trial; Journal Article; Randomized Controlled Trial 
<br/><br/><label>ISSN: </label>0007-1447 
<br/><br/><label>Standard No.: </label>10.1136/bmj.4.5678.265  doi 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Adult<br/>Bronchitis--prevention & control<br/>Chronic Disease<br/>Clinical Trials as Topic<br/>Diarrhea--chemically induced<br/>Diffusion<br/>Humans<br/>Male<br/>Middle Aged<br/>Placebos<br/>Respiratory Function Tests<br/>Seasons<br/>Smoking<br/>Spirometry<br/>Sputum--analysis<br/>Tetracycline--administration & dosage<br/>Weather