PT - JOURNAL ARTICLE AU - Au, David H TI - Use of β blockers in patients with COPD AID - 10.1136/thx.2007.091280 DP - 2008 Apr 01 TA - Thorax PG - 296--298 VI - 63 IP - 4 4099 - http://thorax.bmj.com/content/63/4/296.short 4100 - http://thorax.bmj.com/content/63/4/296.full SO - Thorax2008 Apr 01; 63