PT - JOURNAL ARTICLE ED - , TI - Erratum AID - 10.1136/bmj.1.2679.1039-a DP - 1912 May 04 TA - British Medical Journal PG - 1039--1039 VI - 1 IP - 2679 4099 - http://www.bmj.com/content/1/2679/1039.2.short 4100 - http://www.bmj.com/content/1/2679/1039.2.full SO - BMJ1912 May 04; 1