PT - JOURNAL ARTICLE ED - , TI - Correction AID - 10.1136/bmj.2.5470.1108 DP - 1965 Nov 06 TA - British Medical Journal PG - 1108--1108 VI - 2 IP - 5470 4099 - http://www.bmj.com/content/2/5470/1108.short 4100 - http://www.bmj.com/content/2/5470/1108.full SO - BMJ1965 Nov 06; 2