PT - JOURNAL ARTICLE AU - Andrew Bush AU - Ian Pavord TI - A tale of two letters AID - 10.1136/thoraxjnl-2014-205104 DP - 2014 Mar 01 TA - Thorax PG - 291--291 VI - 69 IP - 3 4099 - http://thorax.bmj.com/content/69/3/291.short 4100 - http://thorax.bmj.com/content/69/3/291.full SO - Thorax2014 Mar 01; 69