scholarly journals Sildenafil for Chronic Obstructive Pulmonary Disease: A Randomized Crossover Trial

2012 ◽  
Vol 9 (3) ◽  
pp. 268-275 ◽  
Author(s):  
David J. Lederer ◽  
Matthew N. Bartels ◽  
Neil W. Schluger ◽  
Frances Brogan ◽  
Patricia Jellen ◽  
...  
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