PT - JOURNAL ARTICLE AU - Criner, Gerard J TI - Measuring diaphragm shortening using ultrasonography to predict extubation success AID - 10.1136/thoraxjnl-2013-204920 DP - 2014 May 01 TA - Thorax PG - 402--404 VI - 69 IP - 5 4099 - http://thorax.bmj.com/content/69/5/402.short 4100 - http://thorax.bmj.com/content/69/5/402.full SO - Thorax2014 May 01; 69