PT - JOURNAL ARTICLE ED - , TI - Discussion AID - 10.1136/pgmj.59.689.140 DP - 1983 Mar 01 TA - Postgraduate Medical Journal PG - 140--141 VI - 59 IP - 689 4099 - http://pmj.bmj.com/content/59/689/140.short 4100 - http://pmj.bmj.com/content/59/689/140.full SO - Postgrad Med J1983 Mar 01; 59