PT - JOURNAL ARTICLE AU - Oliver N Keene AU - Antonio Anzueto AU - Gary T Ferguson AU - Peter M A Calverley TI - Number needed to treat in COPD: exacerbations versus pneumonias AID - 10.1136/thoraxjnl-2013-203403 DP - 2013 Sep 01 TA - Thorax PG - 882--882 VI - 68 IP - 9 4099 - http://thorax.bmj.com/content/68/9/882.1.short 4100 - http://thorax.bmj.com/content/68/9/882.1.full SO - Thorax2013 Sep 01; 68