PT - JOURNAL ARTICLE ED - , TI - CORRECTIONS AID - 10.1136/oem.5.1.50-a DP - 1948 Jan 01 TA - British Journal of Industrial Medicine PG - 50--50 VI - 5 IP - 1 4099 - http://oem.bmj.com/content/5/1/50.2.short 4100 - http://oem.bmj.com/content/5/1/50.2.full SO - Br J Ind Med1948 Jan 01; 5