scholarly journals Early intervention with tiotropium in Chinese patients with GOLD stages I–II chronic obstructive pulmonary disease (Tie-COPD): study protocol for a multicentre, double-blinded, randomised, controlled trial

BMJ Open ◽  
2014 ◽  
Vol 4 (2) ◽  
pp. e003991 ◽  
Author(s):  
Xiaochen Li ◽  
Yumin Zhou ◽  
Shuyun Chen ◽  
Jinping Zheng ◽  
Nanshan Zhong ◽  
...  
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