PT - JOURNAL ARTICLE ED - , TI - Proceedings of the Society of Thoracic and Cardiovascular Surgeons of Great Britain and Ireland AID - 10.1136/thx.36.1.72 DP - 1981 Jan 01 TA - Thorax PG - 72--80 VI - 36 IP - 1 4099 - http://thorax.bmj.com/content/36/1/72.short 4100 - http://thorax.bmj.com/content/36/1/72.full SO - Thorax1981 Jan 01; 36