PT - JOURNAL ARTICLE AU - Liddle, Gunilla TI - Shell Haven Medical Centre AID - 10.1136/oem.13.1.75 DP - 1956 Jan 01 TA - British Journal of Industrial Medicine PG - 75--76 VI - 13 IP - 1 4099 - http://oem.bmj.com/content/13/1/75.short 4100 - http://oem.bmj.com/content/13/1/75.full SO - Br J Ind Med1956 Jan 01; 13