Langer, D <br/><br/>
Quantifying physical activity in COPD: different measures for different purposes.  [electronic resource] 

 -  Thorax  May 2009 
 - 458; author reply 458-9 p.  digital 
<br/><br/> Publication Type: Comment; Letter 
<br/><br/><label>ISSN: </label>1468-3296 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Exercise--physiology<br/>Humans<br/>Leg--physiology<br/>Pulmonary Disease, Chronic Obstructive--physiopathology