PT - JOURNAL ARTICLE AU - Peter J Mazzone TI - Give me a sign, any sign AID - 10.1136/thx.2008.107409 DP - 2009 Sep 01 TA - Thorax PG - 737--738 VI - 64 IP - 9 4099 - http://thorax.bmj.com/content/64/9/737.short 4100 - http://thorax.bmj.com/content/64/9/737.full SO - Thorax2009 Sep 01; 64