Adolph, R J <br/><br/>
The fourth heart sound.  [electronic resource] 

 -  Chest  May 1999 
 - 1480-1 p.  digital 
<br/><br/> Publication Type: Comment; Letter 
<br/><br/><label>ISSN: </label>0012-3692 
<br/><br/><label>Standard No.: </label>10.1378/chest.115.5.1480-a  doi 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Heart Diseases--diagnosis<br/>Heart Sounds<br/>Humans