PT - JOURNAL ARTICLE ED - , TI - Tiotropium improved lung function more than ipratropium in chronic obstructive pulmonary disease AID - 10.1136/ebm.5.6.169 DP - 2000 Nov 01 TA - Evidence Based Medicine PG - 169--169 VI - 5 IP - 6 4099 - http://ebm.bmj.com/content/5/6/169.short 4100 - http://ebm.bmj.com/content/5/6/169.full SO - Evid Based Med2000 Nov 01; 5