PT - JOURNAL ARTICLE AU - Colin M Ogilvie TI - Comroe in Philadelphia AID - 10.1136/thx.47.4.297 DP - 1992 Apr 01 TA - Thorax PG - 297--297 VI - 47 IP - 4 4099 - http://thorax.bmj.com/content/47/4/297.short 4100 - http://thorax.bmj.com/content/47/4/297.full SO - Thorax1992 Apr 01; 47