PT - JOURNAL ARTICLE ED - , TI - Abstracts AID - 10.1136/oem.10.1.65 DP - 1953 Jan 01 TA - British Journal of Industrial Medicine PG - 65--68 VI - 10 IP - 1 4099 - http://oem.bmj.com/content/10/1/65.short 4100 - http://oem.bmj.com/content/10/1/65.full SO - Br J Ind Med1953 Jan 01; 10