RT Journal Article SR Electronic T1 Uplifting results of tiotropium in moderate COPD (GOLD stage 2) JF Evidence Based Medicine JO Evid Based Med FD BMJ Publishing Group Ltd SP 44 OP 45 DO 10.1136/ebm1037 VO 15 IS 2 A1 Huib A M Kerstjens A1 N H T ten Hacken YR 2010 UL http://ebm.bmj.com/content/15/2/44.abstract AB