TY - JOUR T1 - Correspondence JF - British Journal of Industrial Medicine JO - Br J Ind Med SP - 453 LP - 453 DO - 10.1136/oem.49.6.453 VL - 49 IS - 6 AU - G Franco AU - A Massola Y1 - 1992/06/01 UR - http://oem.bmj.com/content/49/6/453.1.abstract N2 - 300 Multiple ChoicesThis is a pdf-only article and there is no markup to show you.full-text.pdf ER -